若Ix-1I+Iy+2I=0,则xy等于_____.快

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若Ix-1I+Iy+2I=0,则xy等于_____.快若Ix-1I+Iy+2I=0,则xy等于_____.快若Ix-1I+Iy+2I=0,则xy等于_____.快|x-1|+|y+2|=0因为|x-1

若Ix-1I+Iy+2I=0,则xy等于_____.快
若Ix-1I+Iy+2I=0,则xy等于_____.
快

若Ix-1I+Iy+2I=0,则xy等于_____.快
|x-1|+|y+2|=0
因为
|x-1|>=0
|y+2|>=0
所以
|x-1|=0
|y+2|=0
x-1=0
y+2=0
x=1
y=-2
xy=1*(-2)=-2

Ix-1I+Iy+2I=0
则Ix-1I=0 ，Iy+2I=0
得出x-1=0 x=1
y+2=0 y=-2
XY=-2

xy=-2

-2

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