1/3+1/6+1/9+1/12+1/15+1/18
=(1/3+1/15)+(1/6+1/12)+(1/9+1/18)
=6/15+3/12+3/18=2/5+1/4+1/6
=24/60+15/60+10/60
=49/60
分开找公共因数 再相加
1/3+1/6+1/9+1/12+1/15+1/18
=(1/3+1/15)+(1/6+1/12)+(1/9+1/18)
=6/15+3/12+3/18 =2/5+1/4+1/6
= 24/60+15/60+10/60
=49/60
这种不是满简单的
1/3+1/15=6/15,1/6+1/12=1/4,1/9+1/18=1/6
6/15+1/4+1/6=6/15+5/12=49/60
等于六十分之四十九
1/3+1/6+1/9+1/12+1/15+1/18
=(1/3+1/15)+(1/6+1/12)+(1/9+1/18)
=6/15+3/12+3/18=2/5+1/4+1/6
=24/60+15/60+10/60
=49/60