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问题: 因式分解

因式分解
(y^2*z^3+z^2*x^3+x^2*y^3)-(y^3*z^2+z^3*x^2+x^3*y^2)

解答:

(y^2*z^3+z^2*x^3+x^2*y^3)-(y^3*z^2+z^3*x^2+x^3*y^2)
=(yz)^2*(z-y)+(zx)^2*(x-z)+(xy)^2*(y-x)
=(yz)^2*(z-y)+(zx)^2*(x-y+y-z)+(xy)^2*(y-x)
=z^2*(z-y)(y-x)(y+x)-x^2*(y-x)(z-y)(z+y)
=(z-y)(y-x)(z-x)(yz+zx+xy)