题目内容
计算:(-5)-(+3)+(-9)-(-7)+
所得结果正确的是( )
1 |
2 |
A.-10
| B.-9
| C.8
| D.-23
|
(-5)-(+3)+(-9)-(-7)+
=-5-3-9+7+
=-17+7
=-9
.
故选:B.
1 |
2 |
=-5-3-9+7+
1 |
2 |
=-17+7
1 |
2 |
=-9
1 |
2 |
故选:B.
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