题目内容
[2-(
-
)×
]÷
+
.
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 10 |
| 1 |
| 10 |
分析:先算小括号里面的减法,再算中括号里面的减法,然后算括号外的除法,最后算加法.
解答:解:[2-(
-
)]÷
+
,
=[2-0]÷
+
,
=2÷
+
,
=20+
,
=20
.
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 10 |
| 1 |
| 10 |
=[2-0]÷
| 1 |
| 10 |
| 1 |
| 10 |
=2÷
| 1 |
| 10 |
| 1 |
| 10 |
=20+
| 1 |
| 10 |
=20
| 1 |
| 10 |
点评:本题考查了四则混合运算,注意运算的法则和顺序,把结果化成最简分数.
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