已知|x-y+2|与根号(x+y-1)互为相反数,求x平方-y平方
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已知|x-y+2|与根号(x+y-1)互为相反数,求x平方-y平方已知|x-y+2|与根号(x+y-1)互为相反数,求x平方-y平方已知|x-y+2|与根号(x+y-1)互为相反数,求x平方-y平方|
已知|x-y+2|与根号(x+y-1)互为相反数,求x平方-y平方
已知|x-y+2|与根号(x+y-1)互为相反数,求x平方-y平方
已知|x-y+2|与根号(x+y-1)互为相反数,求x平方-y平方
|x-y+2|与根号(x+y-1)互为相反数
|x-y+2|+根号(x+y-1)=0
x-y+2=0
x+y-1=0
x-y=-2
x+y=1
x平方-y平方=(x-y)(x+y)=-2*1=-2
|x-y+2|与根号(x+y-1)互为相反数
x-y+2=0
x+y-1=0
x=-1/2
y=3/2
x平方-y平方
=(x+y)(x-y)
=-2
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