很高兴为你解答有用请采纳
(6)(x+y)²(x-y)+(x+y)(x-y)²=(x+y)(x-y)(x+y+x-y)=2x(x-y)(x+y)(7)2a(a-3)²-6a²(3-a)+8a(a-3)=2a(a-3)(a-3+3a+4)=2a(a-3)(4a+1)(8)24xy²z²(x+y-z)-32xyz(z-x-y)²+8xyz³(z-x-y)=8xyz(x+y-z)(3yz+4x+4y-4z-z²)
只要化简吗