(3x/x-1-x/x+1)×x²-1/x 其中x=根号2-2 先化简
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
x(2x-1)=-3x(x+1)+5x²+3
6x+(2x²-3x)-(x²-1)
(2x²-2x+3)(-x³+x-1)
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
(x+1)/(x²+3x+2)+(x²-2x)/(x²-4)
x(x²-1)+2x²(x+1)-3x(2x-5)计算
(x-1)(2x²-3x+2)-x(x+1)(x-2)
①2(x+3)(x-3)=x²+(x-1)(x+1)+2x
已知x²+3x+1=0.(1)x²+1/x²;(2)x-1/x
(1-x/3-x)²/(3-2x-x²/9-x²)³*(x²/x