分解公因式分解 x(y-3)-(2y-6) 2.(x+y)^3-(x-y)^2(x+y) 3.x(x^2-xy)-(4x^2-4xy)
问题描述：
分解公因式分解 x(y-3)-(2y-6) 2.(x+y)^3-(x-y)^2(x+y) 3.x(x^2-xy)-(4x^2-4xy)
答
x(y-3)-(2y-6) =x(y-3)-2(y-3)=(y-3)(x-2)2.(x+y)^3-(x-y)^2(x+y) =(x+y)[(x+y)²-(x-y)²]=4xy(x+y)3.x(x^2-xy)-(4x^2-4xy)=x(x²-xy)-4(x²-xy)=(x²-xy)(x-4)=x(x-y)(x-4)