题目内容
(1
+2
)÷(3-1
).
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
分析:本题按照四则混合运算法则计算即可:先算乘除,再算加减,有括号先算括号里面的.
解答:解:(1
+2
)÷(3-1
)
=(
+
)÷1
,
=(
+
)×
,
=
×
,
=
.
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
=(
| 4 |
| 3 |
| 5 |
| 2 |
| 1 |
| 2 |
=(
| 8 |
| 6 |
| 15 |
| 6 |
| 2 |
| 3 |
=
| 23 |
| 6 |
| 2 |
| 3 |
=
| 23 |
| 9 |
点评:在完成此类含有分数的混合运算时要注意通分、约分,结果要化为最简分数.
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