請問1/3-1/4+1/5-1/6+1/7-1/8+1/9-1/10.....+1/49-1/50=?
提示你:1/3-1/4+1/5-1/6+1/7-1/8+1/9-1/10.....+1/49-1/50=1/3*1/4+1/5*1/6+1/7*1/8+1/9*1/10.....+1/49*1/50,接著就自己算算看唄!