1) (x-3y)² -3x+9y 2) (x²-2x)² +2x(x-2)+1
先化简再求值:(x-2y)²-(x+2y)(x-2y)-(x-3y)(x-y).其中x²+9y
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
因式分解:(1)x²+x (2)4x²-9y (3)x²y-4y
(3x-y)²-2x(4x-5y)-(x+2y)²
已知x²+|y+x|=x-1/4,求(3x+y)²(2x-y)²-(4x²+y&
运用乘法公式(x+y+1)(x+y-1)(2x-y-3)²(2x-y-3)³【(x+2)(x-2)】
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
1、(x-1分之x²)-x-1(因式分解);2、x²(x-y)²-4(y-x)²
(x+y)-(x+y)平方 因式分解 解方程 2x²=3x (3x-1)² - 4=0 5x-15x
y=x²+3x+3/x+1(X>1) Y=x²+2X+3/X+1 的值域
(1):(x+2y)²-(x+y)(3x-y) (2):(2x+3y)²-(2x-3y)²