2x(½x²-1)-3x(1/3x²+2/3)=?
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
6x+(2x²-3x)-(x²-1)
(2x²-2x+3)(-x³+x-1)
(3x/x-1-x/x+1)×x²-1/x 其中x=根号2-2 先化简
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
①2(x+3)(x-3)=x²+(x-1)(x+1)+2x
(x-1)(2x²-3x+2)-x(x+1)(x-2)
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
x(2x-1)=-3x(x+1)+5x²+3
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4