[2(x一y)的3次方一8(x一y)的2次方(x+y)+6y(x一y)的2次方]÷2(x一y)的2次方

问题描述:

[2(x一y)的3次方一8(x一y)的2次方(x+y)+6y(x一y)的2次方]÷2(x一y)的2次方

[2(x一y)³一8(x一y)²(x+y)+6y(x一y)²]÷2(x一y)²=(x一y)一4(x+y)+3y=x-y-4x-4y+3y=-3x-2y不客气,祝你进步