题目内容
(
-
+
)÷
.
| 5 |
| 7 |
| 1 |
| 14 |
| 5 |
| 6 |
| 5 |
| 42 |
分析:根据分数除法法则,除以
,就是乘
的倒数,再根据乘法分配律进一步解答即可.
| 5 |
| 42 |
| 5 |
| 42 |
解答:解:
(
-
+
)÷
=(
-
+
)×
=
×
-
×
+
×
=6-
+7
=12
.
(
| 5 |
| 7 |
| 1 |
| 14 |
| 5 |
| 6 |
| 5 |
| 42 |
=(
| 5 |
| 7 |
| 1 |
| 14 |
| 5 |
| 6 |
| 42 |
| 5 |
=
| 5 |
| 7 |
| 42 |
| 5 |
| 1 |
| 14 |
| 42 |
| 5 |
| 5 |
| 6 |
| 42 |
| 5 |
=6-
| 3 |
| 5 |
=12
| 2 |
| 5 |
点评:由分数除法的计算法则,再根据乘法分配律进行简便计算即可.
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