题目内容
简算:(9
+1
-5
)÷(9
-6
+2
)
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考点:分数的四则混合运算
专题:运算顺序及法则
分析:首先根据9
+1
-5
=9
-(6
-1)+(2
-1)=(9
-6
+2
)+1-1=9
-6
+2
,然后再除以9
-6
+2
即可.
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解答:
解:(9
+1
-5
)÷(9
-6
+2
)
=[9
-(6
-1)+(2
-1)]÷(9
-6
+2
)
=[(9
-6
+2
)+1-1]÷(9
-6
+2
)
=(9
-6
+2
)÷(9
-6
+2
)
=1
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=[9
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=[(9
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=(9
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=1
点评:此题主要考查了分数的四则混合运算,要注意运算顺序,解答此题的关键是判断出:9
+1
-5
=9
-6
+2
.
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| 9 |
| 7 |
| 8 |
| 6 |
| 7 |
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| 9 |
| 6 |
| 7 |
| 7 |
| 8 |
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