因式分解x的三次方+y的三次方-2x²+2xy-2y²
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因式分解x的三次方+y的三次方-2x²+2xy-2y²
因式分解x的三次方+y的三次方-2x²+2xy-2y²
因式分解x的三次方+y的三次方-2x²+2xy-2y²
原式=(x+y)(x^2 - xy + y^2) - 2(x^2 - xy + y^2)
=(x^2 - xy + y^2)(x+y-2)