问题
选择题
已知|a+3|+|b-1|=0，则a+b的相反数是（ ）
A．-4
B．4
C．2
D．-2
答案
由题意，得
，a+3=0 b-1=0
解得
．a=-3 b=1
∴a+b=-3+1=-2，
∴a+b的相反数是2．
故选C．
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已知|a+3|+|b-1|=0，则a+b的相反数是（ ）
A．-4
B．4
C．2
D．-2
由题意，得
，a+3=0 b-1=0
解得
．a=-3 b=1
∴a+b=-3+1=-2，
∴a+b的相反数是2．
故选C．
| 完形填空。 | |||
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