①x²-y²-6x+9②4x²+1/4-2x-9x²
约分下列分式(x-y)/(y-x)³(x²-9)/(6-2x)(x²-1)/(x-x
因式分解 (1).(x+y)(x+y-6)+9 (2).x²-16y²-x-4y
(三分之二x√9x +6x√x/y)+(y√y/x -x²√x/1)
(2x-6)/(x²-4x+4)÷(3-x)/(x²+6x+9)×(2-x)/(x+3)
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
计算①x²-4/x²-4x+3÷x²+3x+2/x²-x②2x+6/4-4x+x
(x-y)³+9(x-y)-6(x-y)²
(2x-y)²-4(x-y)(x+2y)
化简:(2x-y)²-4(x-y)(x+y)
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x
分式计算x²+2x/x²-6x+9÷x²-4/x²-3x
x²+2x/x²-6x+9÷x²-4/x²-3x ,