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下面各题，怎么简便就怎样算813÷7+17×513（12+13-14）×2457×756．
题目详情
下面各题，怎么简便就怎样算
÷7+
×
（
+
-
）×24
57×
．下面各题，怎么简便就怎样算
÷7+
×
（
+
-
）×24
57×
．
÷7+
×
（
+
-
）×24
57×
．
8 13 8 8 13 13
×
（
+
-
）×24
57×
．
1 7 1 1 7 7
（
+
-
）×24
57×
．
5 13 5 5 13 13
+
-
）×24
57×
．
1 2 1 1 2 2
-
）×24
57×
．
1 3 1 1 3 3
）×24
57×
．
1 4 1 1 4 4
．
7 56 7 7 56 56
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
57×
| 7 |
| 56 |
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
57×
| 7 |
| 56 |
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
57×
| 7 |
| 56 |
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
57×
| 7 |
| 56 |
| 1 |
| 7 |
| 5 |
| 13 |
（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
57×
| 7 |
| 56 |
| 5 |
| 13 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
57×
| 7 |
| 56 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
57×
| 7 |
| 56 |
| 1 |
| 3 |
| 1 |
| 4 |
57×
| 7 |
| 56 |
| 1 |
| 4 |
| 7 |
| 56 |
| 7 |
| 56 |
▼优质解答
答案和解析
（1）
÷7+
×
=
×
+
×
=（
+
）×
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
8 13 8 8 813 13 13÷7+
×
=
×
+
×
=（
+
）×
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 7 1 1 17 7 7×
=
×
+
×
=（
+
）×
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
5 13 5 5 513 13 13
=
×
+
×
=（
+
）×
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
8 13 8 8 813 13 13×
+
×
=（
+
）×
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 7 1 1 17 7 7+
×
=（
+
）×
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 7 1 1 17 7 7×
=（
+
）×
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
5 13 5 5 513 13 13
=（
+
）×
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
8 13 8 8 813 13 13+
）×
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
5 13 5 5 513 13 13）×
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 7 1 1 17 7 7
=1×
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 7 1 1 17 7 7
=
；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 7 1 1 17 7 7；
（2）（
+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 2 1 1 12 2 2+
-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 3 1 1 13 3 3-
）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 4 1 1 14 4 4）×24
=
×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 2 1 1 12 2 2×24+
×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 3 1 1 13 3 3×24-
×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
1 4 1 1 14 4 4×24
=12+8-6
=20-6
=14；
（3）57×
=（56+1）×
=56×
+1×
=7+
=7
．
7 56 7 7 756 56 56
=（56+1）×
=56×
+1×
=7+
=7
．
7 56 7 7 756 56 56
=56×
+1×
=7+
=7
．
7 56 7 7 756 56 56+1×
=7+
=7
．
7 56 7 7 756 56 56
=7+
=7
．
7 56 7 7 756 56 56
=7
．
7 56 7 7 756 56 56．
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 7 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 5 |
| 13 |
=（
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 7 |
=
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 7 |
（2）（
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 4 |
=
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 3 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 1 |
| 4 |
=12+8-6
=20-6
=14；
（3）57×
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 7 |
| 56 |
=（56+1）×
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 7 |
| 56 |
=56×
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 7 |
| 56 |
=7+
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 7 |
| 56 |
=7
| 7 |
| 56 |
| 7 |
| 56 |
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黑板上一共写了10040个数字，包括2006个1，2007个2，2008个3，2009个4，2010 2020-10-30 …
:(2x-y)(2x-y)=-5/2(2y^2-64/5),2x(y-1)+4(1/2x-1)=0, 2020-11-01 …
观察下列各式1/（2＾0.5+1）=2＾0.5-1,1/（3＾0.5+2＾0.5）=3＾0.5-2＾ 2020-11-28 …