早教吧作业答案频道 -->其他-->
（1）8.25+[2.85-（325-10.8×29）÷1114]（2）14×（4.85÷518-3.6+6.15×335）+[5.5-1.75×（123+1921）]（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
题目详情
（1）8.25+[2.85-（3
-10.8×
）÷1
]
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．3
-10.8×
）÷1
]
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
2 2 5 5
）÷1
]
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
2 2 9 9 1
]
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
1 1 14 14
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
1 1 4 4
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
5 5 18 18 3
）+[5.5-1.75×（1
+
）]
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
3 3 5 5 1
+
）]
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
2 2 3 3
）]
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
19 19 21 21
| 2 |
| 5 |
| 2 |
| 9 |
| 1 |
| 14 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．3
| 2 |
| 5 |
| 2 |
| 9 |
| 1 |
| 14 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
| 2 |
| 5 |
| 2 |
| 9 |
| 1 |
| 14 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
| 2 |
| 9 |
| 1 |
| 14 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
| 1 |
| 14 |
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
| 2 |
| 3 |
| 19 |
| 21 |
（3）1+2+3+4+…+99+100+99+…+4+3+2+1．
| 19 |
| 21 |
▼优质解答
答案和解析
（1）8.25+[2.85-（3
-10.8×
）÷1
]
=
+[
-（
−
×
）×
]，
=
+[
-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000． 3
2 2 25 5 5-10.8×
）÷1
]
=
+[
-（
−
×
）×
]，
=
+[
-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
2 2 29 9 9）÷1
]
=
+[
-（
−
×
）×
]，
=
+[
-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000． 1
1 1 114 14 14]
=
+[
-（
−
×
）×
]，
=
+[
-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
33 33 338 8 8+[
-（
−
×
）×
]，
=
+[
-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
57 57 5720 20 20-（
−
×
）×
]，
=
+[
-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
17 17 175 5 5−
×
）×
]，
=
+[
-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
54 54 545 5 5×
2 2 29 9 9）×
]，
=
+[
-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
14 14 1415 15 15]，
=
+[
-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
33 33 338 8 8+[
-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
57 57 5720 20 20-（
-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
17 17 175 5 5-
）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
12 12 125 5 5）×
]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
14 14 1415 15 15]，
=
+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
33 33 338 8 8+[
−
]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
57 57 5720 20 20−
14 14 1415 15 15]，
=
+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
33 33 338 8 8+
，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
23 23 2312 12 12，
=
．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
145 145 14524 24 24．
（2）
×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
1 1 14 4 4×（4.85÷
-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
5 5 518 18 18-3.6+6.15×3
）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000． 3
3 3 35 5 5）+[5.5-1.75×（1
+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000． 1
2 2 23 3 3+
）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
19 19 1921 21 21）]
=
×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
1 1 14 4 4×（
×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
97 97 9720 20 20×
-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
18 18 185 5 5-
+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
18 18 185 5 5+
×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
123 123 12320 20 20×
）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
18 18 185 5 5）+[
-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
11 11 112 2 2-
×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
7 7 74 4 4×（
+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
5 5 53 3 3+
）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
19 19 1921 21 21）]，
=
×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
1 1 14 4 4×[（
+
−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
97 97 9720 20 20+
123 123 12320 20 20−1）×
]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
18 18 185 5 5]+[
-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
11 11 112 2 2-
×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
7 7 74 4 4×
]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
54 54 5421 21 21]，
=
×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
1 1 14 4 4×[10×
]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
18 18 185 5 5]+[
−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
11 11 112 2 2−
]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000． −
27 27 276 6 6]，
=
×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
1 1 14 4 4×36+1，
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 2 |
| 5 |
| 2 |
| 9 |
| 1 |
| 14 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 54 |
| 5 |
| 2 |
| 9 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000． 3
| 2 |
| 5 |
| 2 |
| 9 |
| 1 |
| 14 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 54 |
| 5 |
| 2 |
| 9 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 2 |
| 9 |
| 1 |
| 14 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 54 |
| 5 |
| 2 |
| 9 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000． 1
| 1 |
| 14 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 54 |
| 5 |
| 2 |
| 9 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 54 |
| 5 |
| 2 |
| 9 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 57 |
| 20 |
| 17 |
| 5 |
| 54 |
| 5 |
| 2 |
| 9 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 17 |
| 5 |
| 54 |
| 5 |
| 2 |
| 9 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 54 |
| 5 |
| 2 |
| 9 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 33 |
| 8 |
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 57 |
| 20 |
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 17 |
| 5 |
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 12 |
| 5 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 14 |
| 15 |
=
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 33 |
| 8 |
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 57 |
| 20 |
| 14 |
| 15 |
=
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 33 |
| 8 |
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 23 |
| 12 |
=
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 145 |
| 24 |
（2）
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 1 |
| 4 |
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 5 |
| 18 |
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000． 3
| 3 |
| 5 |
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000． 1
| 2 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 1 |
| 4 |
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 97 |
| 20 |
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 18 |
| 5 |
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 18 |
| 5 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 11 |
| 2 |
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 7 |
| 4 |
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 5 |
| 3 |
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 19 |
| 21 |
=
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 1 |
| 4 |
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 97 |
| 20 |
| 123 |
| 20 |
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 18 |
| 5 |
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 11 |
| 2 |
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 7 |
| 4 |
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 54 |
| 21 |
=
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 1 |
| 4 |
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 18 |
| 5 |
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 11 |
| 2 |
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000． −
| 27 |
| 6 |
=
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
| 1 |
| 4 |
=10．
（3）1+2+3+4+…+99+100+99+…+4+3+2+1
=[（1+100）×100÷2]+[（99+1）×99÷2]，
=5050+4950，
=10000．
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