x²-1/x²-2x+1÷x+1/x-1 X 1-x/1+x
2(x²-1²)
计算:[(x²-2x+1)/(x²-1)]÷[(x-1)(x²+x)]-x
化简~(x²+3x+9/x²-27)+(6x/9x-x²)-(x-1/6+2x)
x²-1/x²-2x+1÷x+1/x-1 X 1-x/1+x
(x-3)|2-x| /(x-1)x²
1.(1+2/X-X+1/X-2)÷X+4/X²-2X
7/x²+x+3/x²-x=6/x²-1
(x-1)(x²+mx+n)=x²-6x²+11x-6
log2(x²+1)
(1)(x²-2x)²+2(x²-2x)+1
分解因式(2X²-3X+1)²-22X²+33X-1
因式分解:(2x²-3x+1)²-22x²+33x-1