速求：ac(a+c)(a-c)+ba(b+a)(b-a)+cb(c+b)(c-b)怎样化为a^3(c-b)-c^3(a-b)+b^3(a+c)?

ac(a+c)(a-c)+ba(b+a)(b-a)+cb(c+b)(c-b)=a^3c-ac^3+b^3a-ba^3+c^3b-cb^3=(a^3c-ba^3)+(-ac^3+c^3b)+(b^3a-cb^3)=a^3(c-b)-c^3(a-b)+b^3(a-c)