(x^3+y^3)(x+y)变成（x+y）^2 *(x^2-xy+y^2)急求
问题描述：
(x^3+y^3)(x+y)变成（x+y）^2 *(x^2-xy+y^2)急求
(x+y)(x^3+y^3)
=(x+y)^2(x^2-xy+y^2)
答
(x+y)(x^3+y^3)
=(x+y)(x+y)(x^2-xy+y^2)
=(x+y)^2(x^2-xy+y^2)x^3+y^3怎么变成x^2-xy+y^2的？x^3+y^3=(x+y)(x^2-xy+y）这是公式，你可以从将右边展开，会发现是等于左边的