①3(y-x)²+2(x-y)=3(x-y)²+2(x-y)=(x-y)(3x-3y+2)②4a(x-2)²-2b(2-x)³=4a(x-2)²+2b(x-2)³=(x-2)²[4a+2b(x-2)]=(x-2)²(4a+2bx-4b)③6x³y（x-y）³-4xy³（y-x...