(9x²/-3x-y)+(y²/y+3x)
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
(3x-y)²-2x(4x-5y)-(x+2y)²
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
因式分解:(x+3y)²-x-3y
3m(x-y)-2(y-x)²因式分解
3(x-2y)²+(x-2y)因式分解
[(3x-2y)²-(3x+2y)(3x-2y)]/(2y-3y)
因式分解:(1)x²+x (2)4x²-9y (3)x²y-4y
合并多项式:5(x-y)²-(x-y)-8(x-y)²-3(x-y)