(x²+2xy+y²)(x²-xy+y²)²

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(x²+2xy+y²)(x²-xy+y²)²
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(x²+2xy+y²)(x²-xy+y²)²
(x²+2xy+y²)(x²-xy+y²)²

(x²+2xy+y²)(x²-xy+y²)²
原式=(x+y)^2(x^2-xy+y^2)^2
根据立方和公式
=(x^3+y^3)^2