(x-y)²+16(x-y)+( )=( )²

(x-y)²+16(x-y)+( )=( )² 因式分解:x²(x-y)+(y-x) 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 2.(x+y)²(x-y)²-(x-y)(x+y）(x²+y²) 已知x+y=1,xy=-二分之一,求x（x+y)(x-y)-x(x+y)² 已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y [(y-2x)(-2x-y)-4(x-2y)²]*2y,其中x=1,y=2 若|x+2y-1|+y²+4y+4=0,求（2x-y）²-2（2x-y)(x+2y)+(x+2y)& (2x-y)²-4(x-y)(x+2y) (x-y)³+9(x-y)-6(x-y)² (x-y)³(x-y)²(y-x)等于多少 化简：（2x-y)²-4(x-y)(x+y)