(1)(2x²-7x+5)+(3x-1)-(x²-1) (2)x-3(1-2x+x²)+3
化简~(x²+3x+9/x²-27)+(6x/9x-x²)-(x-1/6+2x)
1/X²+3X+2 +1/X²+5X+6 +1/X²+7X+12 +1/X²+9
(x²-5x+6分之x²-3x+2)²/(x²-2x-3分之x-1)²
(x-3)|2-x| /(x-1)x²
分解因式(2X²-3X+1)²-22X²+33X-1
因式分解:(2x²-3x+1)²-22x²+33x-1
已知x²-3x+1=0,求2x^3-3x²-7x+2009,求x²+1/x²+2
试说明不论X取何值代数式(x²+5x²+4x-1)-(-x²-3x+2x²-3)
计算 2(x²-x+1)-(-2x+3x²)+(1-x)
计算题:3x(x²-3x+2)-x²(3x-1)
① X²+X-1+0,则2X³+3X²-X=
3x²-[5x-(1/2x-3)+2x²]怎样去括号?