变相的分式计算题首先,1/(n-1)*n = 1/(n-1) - 1/n原式 = X * (1/1*2 + 1/2*3 + 1/3*4 + ... + 1/2007*2008) = X * (1/1 - 1/2 + 1/2 - 1/3 + 1/3 - 1/4 ... + 1/2007 - 1/2008) = X * (1-1/2008) = X * 2007...