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计算：（1）21×24-（4.46+0.24）（2）（3.84+3.84+3.84+3.84）×2.5（3）16×19-49×517-1615×29．
题目详情
计算：
（1）21×24-（4.46+0.24）
（2）（3.84+3.84+3.84+3.84）×2.5
（3）16×
-
×
-
×
．
-
×
-
×
．
1 1 9 9
×
-
×
．
4 4 9 9
-
×
．
5 5 17 17
×
．
16 16 15 15
．
2 2 9 9
（1）21×24-（4.46+0.24）
（2）（3.84+3.84+3.84+3.84）×2.5
（3）16×
| 1 |
| 9 |
| 4 |
| 9 |
| 5 |
| 17 |
| 16 |
| 15 |
| 2 |
| 9 |
| 1 |
| 9 |
| 4 |
| 9 |
| 5 |
| 17 |
| 16 |
| 15 |
| 2 |
| 9 |
| 1 |
| 9 |
| 4 |
| 9 |
| 5 |
| 17 |
| 16 |
| 15 |
| 2 |
| 9 |
| 4 |
| 9 |
| 5 |
| 17 |
| 16 |
| 15 |
| 2 |
| 9 |
| 5 |
| 17 |
| 16 |
| 15 |
| 2 |
| 9 |
| 16 |
| 15 |
| 2 |
| 9 |
| 2 |
| 9 |
▼优质解答
答案和解析
（1）21×24-（4.46+0.24）
=21×24-4.7
=504-4.7
=499.3；
（2）（3.84+3.84+3.84+3.84）×2.5
=（3.84×4）×2.5
=3.84×（4×2.5）
=3.84×10
=38.4；
（3）16×
-
×
-
×
=
-
-
=
-
=
．
1 1 19 9 9-
×
-
×
=
-
-
=
-
=
．
4 4 49 9 9×
-
×
=
-
-
=
-
=
．
5 5 517 17 17-
×
=
-
-
=
-
=
．
16 16 1615 15 15×
=
-
-
=
-
=
．
2 2 29 9 9
=
-
-
=
-
=
．
16 16 169 9 9-
-
=
-
=
．
20 20 20153 153 153-
=
-
=
．
32 32 32135 135 135
=
-
=
．
28 28 2817 17 17-
=
．
32 32 32135 135 135
=
．
3236 3236 32362295 2295 2295．
=21×24-4.7
=504-4.7
=499.3；
（2）（3.84+3.84+3.84+3.84）×2.5
=（3.84×4）×2.5
=3.84×（4×2.5）
=3.84×10
=38.4；
（3）16×
| 1 |
| 9 |
| 4 |
| 9 |
| 5 |
| 17 |
| 16 |
| 15 |
| 2 |
| 9 |
=
| 16 |
| 9 |
| 20 |
| 153 |
| 32 |
| 135 |
=
| 28 |
| 17 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 1 |
| 9 |
| 4 |
| 9 |
| 5 |
| 17 |
| 16 |
| 15 |
| 2 |
| 9 |
=
| 16 |
| 9 |
| 20 |
| 153 |
| 32 |
| 135 |
=
| 28 |
| 17 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 4 |
| 9 |
| 5 |
| 17 |
| 16 |
| 15 |
| 2 |
| 9 |
=
| 16 |
| 9 |
| 20 |
| 153 |
| 32 |
| 135 |
=
| 28 |
| 17 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 5 |
| 17 |
| 16 |
| 15 |
| 2 |
| 9 |
=
| 16 |
| 9 |
| 20 |
| 153 |
| 32 |
| 135 |
=
| 28 |
| 17 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 16 |
| 15 |
| 2 |
| 9 |
=
| 16 |
| 9 |
| 20 |
| 153 |
| 32 |
| 135 |
=
| 28 |
| 17 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 2 |
| 9 |
=
| 16 |
| 9 |
| 20 |
| 153 |
| 32 |
| 135 |
=
| 28 |
| 17 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 16 |
| 9 |
| 20 |
| 153 |
| 32 |
| 135 |
=
| 28 |
| 17 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 20 |
| 153 |
| 32 |
| 135 |
=
| 28 |
| 17 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 32 |
| 135 |
=
| 28 |
| 17 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 28 |
| 17 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 32 |
| 135 |
=
| 3236 |
| 2295 |
| 3236 |
| 2295 |
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