5/12=50/120
5/8=75/120
2/5=48/120
1/15=8/120
11/40=33/120
7/24=35/120
50+75+48+8+33+35=249=83*3
因此每组和是83/120
因此可以分为这样的三组:
50/120+33/120=5/12+11/40
75/120+8/120=5/8+1/15
48/120+35/120=2/5+7/24
12/15+11/40,5/8+1/15,2/5+7/24
5/12=50/120
5/8=75/120
2/5=48/120
1/15=8/120
11/40=33/120
7/24=35/120
50+75+48+8+33+35=249=83*3
因此每组和是83/120
因此可以分为这样的三组:
50/120+33/120=5/12+11/40
75/120+8/120=5/8+1/15
48/120+35/120=2/5+7/24
12/15+11/40,5/8+1/15,2/5+7/24