题目内容
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 7 |
分析:
÷7就等于
乘以7的倒数,然后根据乘法分配律,提取公因数
,进而计算得解.
| 5 |
| 12 |
| 5 |
| 12 |
| 1 |
| 7 |
解答:解:
÷7+
×
=
×
+
×
=
×(
+
)
=
×1
=
故答案为:
.
| 5 |
| 12 |
| 7 |
| 12 |
| 1 |
| 7 |
=
| 5 |
| 12 |
| 1 |
| 7 |
| 7 |
| 12 |
| 1 |
| 7 |
=
| 1 |
| 7 |
| 5 |
| 12 |
| 7 |
| 12 |
=
| 1 |
| 7 |
=
| 1 |
| 7 |
故答案为:
| 1 |
| 7 |
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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