若x.y满足|x-2|+|y+1|=0,且2b+3x=2y+b+7,求b的值
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若x.y满足|x-2|+|y+1|=0,且2b+3x=2y+b+7,求b的值
若x.y满足|x-2|+|y+1|=0,且2b+3x=2y+b+7,求b的值
若x.y满足|x-2|+|y+1|=0,且2b+3x=2y+b+7,求b的值
若|x-2|+|y+1|=0
则 x-2=0 y+1=0
so x=2 y=-1
当 x=2 y=-1代入2b+3x=2y+b+7
b=-1
GHJ
x=2 y=-1 b=-1
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