化简y(x+y)+(x+y)(x-y)-x^2
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化简y(x+y)+(x+y)(x-y)-x^2化简y(x+y)+(x+y)(x-y)-x^2化简y(x+y)+(x+y)(x-y)-x^2y(x+y)+(x+y)(x-y)-x^2=(x+y)(y+x
化简y(x+y)+(x+y)(x-y)-x^2
化简y(x+y)+(x+y)(x-y)-x^2
化简y(x+y)+(x+y)(x-y)-x^2
y(x+y)+(x+y)(x-y)-x^2
=(x+y)(y+x-y)-x^2
=(x+y)*x-x^2
=xy