题目内容
31
×41
-11
×41
-41.5×20.
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
分析:根据乘法的分配律可得41
×(31
-11
-20),进行简便计算.
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| 2 |
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| 3 |
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| 3 |
解答:解:31
×41
-11
×41
-41.5×20
=41
×(31
-11
-20)
=41
×0
=0.
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
=41
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
=41
| 1 |
| 2 |
=0.
点评:考查了分数的简便计算,注意灵活运用公式可以使计算简便.
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