【2(x-y)³-8(x-y)²(x+y)+6y(x-y)²】÷2(x-y)²

问题描述:

【2(x-y)³-8(x-y)²(x+y)+6y(x-y)²】÷2(x-y)²

=2(x-y)³÷2(x-y)²-8(x-y)²(x+y)÷2(x-y)²+6y(x-y)²÷2(x-y)²
=(x-y)-4(x+y)+3y
=x-y-4x-4y+3y
=-3x-2y