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（x+y-xy-1)^2
=[(x-xy)+(y-1)]^2
=[x(1-y)-(1-y)]^2
=[(x-1)(1-y)]^2
=(x-1)^2(1-y)^2
=(x-1)^2(y-1)^2
=[(x-xy)+(y-1)]^2
=[x(1-y)-(1-y)]^2
=[(x-1)(1-y)]^2
=(x-1)^2(1-y)^2
=(x-1)^2(y-1)^2
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