题目内容
| 7 |
| 4 |
| 1 |
| 3 |
| 4 |
| 3 |
| 3 |
| 2 |
分析:根据分数除法的意思,除以一个数,等于乘这个数的倒数,然后再根据乘法分配律进行简算.
解答:解:
÷
+15÷
-
,
=
×3+15×
-
,
=
×7+15×
-2×
,
=
×(7+15-2),
=
×20,
=15.
| 7 |
| 4 |
| 1 |
| 3 |
| 4 |
| 3 |
| 3 |
| 2 |
=
| 7 |
| 4 |
| 3 |
| 4 |
| 6 |
| 4 |
=
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
=
| 3 |
| 4 |
=
| 3 |
| 4 |
=15.
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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