题目内容
| 4 |
| 5 |
| 5 |
| 13 |
| 3 |
| 5 |
| 5 |
| 13 |
| 5 |
| 13 |
| 3 |
| 5 |
分析:观察发现,几个乘法算式中,都含有
,可考虑用分配律.
| 5 |
| 13 |
解答:解:原式=
×(
-
-
)=
×(-
)=-
.
| 5 |
| 13 |
| 4 |
| 5 |
| 3 |
| 5 |
| 8 |
| 5 |
| 5 |
| 13 |
| 7 |
| 5 |
| 7 |
| 13 |
点评:在进行有理数运算时,可考虑用运算律,使运算简便.
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题目内容
| 4 |
| 5 |
| 5 |
| 13 |
| 3 |
| 5 |
| 5 |
| 13 |
| 5 |
| 13 |
| 3 |
| 5 |
| 5 |
| 13 |
| 5 |
| 13 |
| 4 |
| 5 |
| 3 |
| 5 |
| 8 |
| 5 |
| 5 |
| 13 |
| 7 |
| 5 |
| 7 |
| 13 |