(3x-2y)²(3x+2y)²(9x²+4y²)²
(3x-y)²-2x(4x-5y)-(x+2y)²
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
(x-2y)²+(2x-4y)(x+y)+(x+y)²
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
因式分解:(1)x²+x (2)4x²-9y (3)x²y-4y
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
已知x,y为实数,且2(x+2y)=x²+y²+5求代数式3x-4y分之x²+y²
3(x-2y)²+(x-2y)因式分解
3m(x-y)-2(y-x)²因式分解
(x-y)的四次方(x-y)-2(x-y)²(y-x)³等于?
[(3x-2y)²-(3x+2y)(3x-2y)]/(2y-3y)