Я решала так:
НОК(24, 48, 4, 12, 16)=48
6 13/24=144/24=228/48=6
14 7/24=336/24=672/48=14
2 3/4=11/4=132/48=2 36/48
1 7/12=19/12=76/48=1 28/48
1 1/16=17/16=61/48=1 13/48
6-((14-10 31/48)-(2 36/48-1 28/48))-1 13/48=6-(3 17/48-1 8/48)1 13/48=6-2 9/48-1 13/48=3 39/48-1 13/48=2 26/48
Но можно было и не переводить обратно в целые части:
10 31/48=511/48
288/48-((672/48-511/48)-(132/48-76/48))-61/48=288/48-(161/48-56/48)-61/48=288/48-105/48-61/48=183/48-61/48=122/48
122/48=2 26/48