计算:1/x(x+1)+1/(x+1)(x+2)+……+1/(x+2007)(x+2008).
计算:1/x(x+1)+1/(x+1)(x+2)+……+1/(x+2007)(x+2008).
计算1/x[x+1]+1/[x+1][x+2]+.+1/[x+2006][x+2007]
分式混合计算(x+1/x^2-x - x/x^2-2x+1)*x
计算1/x(x+1) +1/x(x+1)(x+2) +1/x(x+2)(x+3) +.+1/x(x+2007)(x+20
计算x(x+1)/1+(x+1)(x+2)/1+(X+2)(x+3)/1+……+(x+2006)(x+2007)/1 ,
计算1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)+……+1/(x+2007)(x+200
计算:1x(x+1)+1(x+1)(x+2)+1(x+2)(x+3)+…+1(x+2008)(x+2009)
已知x³+x+1=0,求值x^2009+x^2008+x^2007+……+x^2+x+1
化简:1+x+x(1+x)+x(1+x)^2+……+x(1+x)^2006
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)