题目内容
(
×
)×
×125.
| 17 |
| 25 |
| 9 |
| 50 |
| 30 |
| 17 |
分析:把125看作25×5,运用乘法交换律与结合律简算.
解答:解:(
×
)×
×125,
=
×
×
×25×5,
=(
×25)×(
×5)×
,
=17×
×
,
=27.
| 17 |
| 25 |
| 9 |
| 50 |
| 30 |
| 17 |
=
| 17 |
| 25 |
| 9 |
| 50 |
| 30 |
| 17 |
=(
| 17 |
| 25 |
| 9 |
| 50 |
| 30 |
| 17 |
=17×
| 9 |
| 10 |
| 30 |
| 17 |
=27.
点评:认真分析数据,采用拆数法,运用运算顺序,使计算简便.
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