x-y-x平方+2xy-y平方+2=0,求x-y的值

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x-y-x平方+2xy-y平方+2=0,求x-y的值
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x-y-x平方+2xy-y平方+2=0,求x-y的值
x-y-x平方+2xy-y平方+2=0,求x-y的值

x-y-x平方+2xy-y平方+2=0,求x-y的值
上题整理得:(X-Y)-(X-Y)平方+2=0
得 (X-Y)平方-(X-Y)-2=0
(X-Y-2)(X-Y+1)=0
得到X-Y=2或者-1

2或-1

x-y-x平方+2xy-y平方+2=0
(x-y)-(x-y)平方+2=0
(x-y)(1-x+y)=-2
设X-Y=A
A(1-A)=-2
A=2 或-1