(-2x²/y)²·(-2y²/3x)³÷(2y/x)^4
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
(x-2y)²+(2x-4y)(x+y)+(x+y)²
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
(3x-y)²-2x(4x-5y)-(x+2y)²
(-2x²/y)²·(-2y²/3x)³÷(2y/x)^4
已知x²-y²=10,求[(x+y)³-2y(x+y)²-4(x+y)]÷(x+
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
1/2 x²y·( )=2x³y-x²y²
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
{(x-y)²+(x+y)(x-y)}÷2x
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y