题目内容
(
-
)×
.
| 4 |
| 5 |
| 2 |
| 3 |
| 15 |
| 4 |
分析:先算括号内的,再算括号外的.括号内的通分计算,然后算乘法.
解答:解:(
-
)×
,
=
×
,
=
.
| 4 |
| 5 |
| 2 |
| 3 |
| 15 |
| 4 |
=
| 2 |
| 15 |
| 15 |
| 4 |
=
| 1 |
| 2 |
点评:注意运算顺序,有括号的先算括号里面的,再算括号外面的.
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| 4 |
| 5 |
| 2 |
| 3 |
| 15 |
| 4 |
| 4 |
| 5 |
| 2 |
| 3 |
| 15 |
| 4 |
| 2 |
| 15 |
| 15 |
| 4 |
| 1 |
| 2 |