Разности суммы
63-18=45 19+24=43
34-18=16 26+18=44
80-61=19 32+48=80
<span>91 1/6+3 5/18=91 3/18+3 5/18=94 8/18=94 4/9,
1 4/15+2 3/20=1 16/60+2 9/60=3 25/60=3 5/12,
5 1/8+41 7/12=5 3/24+ 41 14/24=46 17/24,
39 5/6+12 5/9</span>=39 15/18+12 10/18=51 25/18=52 7/18
8+(40-20) =28; 9+(30-10) = 29;(60-50)+7 = 17; (45-10) - 4 = 31; (9+6) + 3 = 18