1/3
=16/48
=1/48+2/48+3/48+4/48+6/48
=1/48+1/24+1/16+1/12+1/8(因为1/12=1/36+1/18、1/8=1/56+1/28+1/14)
=1/48+1/24+1/16+1/36+1/18+1/56+1/28+1/14(1/18=1/54+1/27、1/14=1/42+1/21)
=1/48+1/24+1/16+1/36+1/54+1/27+1/56+1/28+1/42+1/21
(你问的好是时候、我补习班老师刚让我们做的、我做出来没多久、、、呵呵、、、这已经是我极限了、在小的数是的确算不出来了、)