题目内容
[1÷（
+
）]×
．
| 3 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
分析：根据混合运算的顺序，先算小括号里面的，再算中括号里面的，最后算括号外面的．
解答：解：[1÷（
+
）]×
=[1÷
]×
=[1×
]×
=
×
=
．
| 3 |
| 4 |
| 1 |
| 3 |
| 3 |
| 4 |
=[1÷
| 13 |
| 12 |
| 3 |
| 4 |
=[1×
| 12 |
| 13 |
| 3 |
| 4 |
=
| 12 |
| 13 |
| 3 |
| 4 |
=
| 9 |
| 13 |
点评：此题主要考查分数四则混合运算的顺序和分数乘法、除法的计算方法．
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