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x^3+x^2y-xy^2-y^3 =x^2(X+Y)-y^2(x+y) =(x+y)(x^2-y^2) =(x+y)(x+y)(x-y) =(x+y)^2(x-y) 你的結果是對的,但還可以再分解呀! (x+y)^2(x-y)才是完整的!
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