用三种方法把x^3-xy^2+x^2y-y^3进行因式分解

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用三种方法把x^3-xy^2+x^2y-y^3进行因式分解
用三种方法把x^3-xy^2+x^2y-y^3进行因式分解

用三种方法把x^3-xy^2+x^2y-y^3进行因式分解
第一种:
x^3-xy^2+x^2y-y^3
=(x^3-xy^2)+(x^2y-y^3)
=x(x^2-y^2)+y(x^2-y^2)
=(x+y)(x^2-y^2)
=(x+y)(x+y)(x-y)
=(x-y)(x+y)^2
第二种:
x^3-xy^2+x^2y-y^3
=(x^3-y^3)+(x^2y-xy^2)
=(x-y)(x^2+xy+y^2)+xy(x-y)
=(x-y)(x^2+2xy+y^2)
=(x-y)(x+y)^2
第三种:
x^3-xy^2+x^2y-y^3
=(x^3+x^2y)-(xy^2+y^3)
=x^2(x+y)-y^2(x+y)
=(x^2-y^2)(x+y)
=(x+y)(x-y)(x+y)
=(x-y)(x+y)^2