(x+y)(x-2y)+(x-y)^2 -(6x^2-3xy^2)/(3y)

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(x+y)(x-2y)+(x-y)^2 -(6x^2-3xy^2)/(3y)
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(x+y)(x-2y)+(x-y)^2 -(6x^2-3xy^2)/(3y)
(x+y)(x-2y)+(x-y)^2 -(6x^2-3xy^2)/(3y)

(x+y)(x-2y)+(x-y)^2 -(6x^2-3xy^2)/(3y)
2x^2-2x^2/y-y^2-2xy(这是这道题的答案,在做的时候感觉有点错,是题目错了,还是本来就这样.)