3(x-y)³(y-x)²2(x-y)=?(急~)
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
已知方程组2x-y=10,x+2y=11,求(2x-y)³-(2x-y)²(x-3y)的值
化简,亲快啊啊急!(3x-2y)(7x-y)-(4x+3y)(x-y)
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
1/2 x²y·( )=2x³y-x²y²
已知方程组2x+y=6 x-3y=1,求7y(x-3y)²-2(3y-x)³的值
已知|x|=2,|y|=3,|x+y|=-(x+y),求代数式(3x-2)-3(x-y)的值. 急
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
(3x-y)²-2x(4x-5y)-(x+2y)²