题目内容
| 7 |
| 12 |
| 8 |
| 9 |
| 3 |
| 12 |
| 8 |
| 9 |
分析:先把除法变成乘法,然后使用乘法分配律简算.
解答:解:
÷
-
÷
,
=
×
-
×
,
=(
-
)×
,
=
×
,
=
.
| 7 |
| 12 |
| 8 |
| 9 |
| 3 |
| 12 |
| 8 |
| 9 |
=
| 7 |
| 12 |
| 9 |
| 8 |
| 3 |
| 12 |
| 9 |
| 8 |
=(
| 7 |
| 12 |
| 3 |
| 12 |
| 9 |
| 8 |
=
| 1 |
| 3 |
| 9 |
| 8 |
=
| 3 |
| 8 |
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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