化简 x²-1/3x+3-x-1/2
化简(X+2)\(X^2+X)+(2X+1)\(X^2+3X+2)-(X-3)\(X^2+2X)
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
化简[(2X-3/X)-1]/(X平方-9/X)
6x+(2x²-3x)-(x²-1)
(2x²-2x+3)(-x³+x-1)
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
化简:1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+1(x+3)(x+4)
化简:1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+...+1/(x+8)(x+9)
化简:1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+.+1/(x+2007)(x+2008)
化简:1/X(X+1) +1/(X+1)+(X+2) +1/(X+2)(X+3) +.+1/(X+2006)(X+200