计算:[(x²-2x+1)/(x²-1)]÷[(x-1)(x²+x)]-x
计算:[(x²-2x+1)/(x²-1)]÷[(x-1)(x²+x)]-x
计算 2(x²-x+1)-(-2x+3x²)+(1-x)
计算:3x²-[5x-(1/2x-3)+2x²]
(1)(x²-2x)²+2(x²-2x)+1
(x²-2x)²+2x²-4x+1
计算:(1-x/3-x)²÷(x²-6x+9/9-x²)²•1/(x
(x²-5x+6分之x²-3x+2)²/(x²-2x-3分之x-1)²
2(x²-1²)
分式计算,((x+1)²(1-x)²)/((x²-1)²)÷((x-1)²)/(
先化简再求值x²-x/(x+1)×x²-1/(x²-2x+1)
计算题:3x(x²-3x+2)-x²(3x-1)
计算:(2x+y-1)²