题目内容
计算:-3| 4 |
| 17 |
| 2 |
| 15 |
| 4 |
| 17 |
| 13 |
| 15 |
| 13 |
| 15 |
分析:本题可使用乘法分配律使计算简便.
解答:解:原式=-3
×(+2
)+(4-7
)×14
=-3
×(+2
)+(-3
)×14
=-3
×(+2
+14
)
=-
×17
=-55.
| 4 |
| 17 |
| 2 |
| 15 |
| 4 |
| 17 |
| 13 |
| 15 |
=-3
| 4 |
| 17 |
| 2 |
| 15 |
| 4 |
| 17 |
| 13 |
| 15 |
=-3
| 4 |
| 17 |
| 2 |
| 15 |
| 13 |
| 15 |
=-
| 55 |
| 17 |
=-55.
点评:做此题时不仅需要细心,而且需要灵活运用运算定律.
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