[5/7*2 1/3*5/6-1] : [1-7/8*3/15*3/14]=5/11
1)5/7*2 1/3=1 2/3
2)1 2/3*5/6=1 7/18
3)1 7/18-1=7/18
4)7/8*3/15=7/40
5)7/40*3/14=3/80
6)1-3/80=77/80
7)7/18:77/80=5/11
[5/7*2 1/3*5/6-1] : [1-7/8*3/15*3/14]=5/11
1)5/7*2 1/3=1 2/3
2)1 2/3*5/6=1 7/18
3)1 7/18-1=7/18
4)7/8*3/15=7/40
5)7/40*3/14=3/80
6)1-3/80=77/80
7)7/18:77/80=5/11