(x-2y)(x+y)+(x+y)计算
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(x-2y)(x+y)+(x+y)计算(x-2y)(x+y)+(x+y)计算(x-2y)(x+y)+(x+y)计算=x^2+x*y-2x*y-2y^2+x+y=x^2-x*y-2y^2+x+y
(x-2y)(x+y)+(x+y)计算
(x-2y)(x+y)+(x+y)计算
(x-2y)(x+y)+(x+y)计算
=x^2+x*y-2x*y-2y^2+x+y =x^2-x*y-2y^2+x+y
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