计算(2/1+3/1+...+2005/1)x(l+2\1+2005\1)x(2\1+3\1+...+2004\1)
计算 x(x+3)-(x-1)(x-2)
如何计算 (x+1)(x+2)(x+3)(x+4)
计算:(x+1)(x-2)(x-3)(x-6)
计算(X-1)(X-2)(X-3)(X-4)
计算1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3).+1/(x+2003)(x+2004)
计算3/x-2+2/1-x
计算(-2x+1)(-3x+5)
x(x²-1)+2x²(x+1)-3x(2x-5)计算
计算,X(3x-2)(x+1)-2x(x-2)(x+2)
计算x^2-5x+6/x^2-1/x^2+x/x-3
计算:(x-1)(x^2-4X+3)-x(x^2-5X+2)有过程
计算x/(x^2-1) + (x^-x+1)/(x^3-x^2+x-1)+(x^2+x+1)/(x^3+x^2+x+1)