1/50+2/50+3/50+.+97/50+98/50+99/50
=[(1+99)+(2+98)+(3+97)+.+50]/50
=[100*(99-1)/2+50]/50
=98+1
=99
1除以50+2除以50.直到99除以50
1/50+2/50+3/50+.+97/50+98/50+99/50
=[(1+99)+(2+98)+(3+97)+.+50]/50
=[100*(99-1)/2+50]/50
=98+1
=99