将(2-1)/1*2断开,变成两个分式相减(2-1)/1*2=2/1*2 - 1/1*2在约分=1-1/2同样的,(3-2)/2*3=3/2*3 - 2/2*3 = 1/2 - 1/3所以最后是(1-1/2) + (1/2-1/3) + (1/3-1/3) + ...+ (1/2007-1/2008)因为是加法,所以可以把括号全...