Ответ:
11/20-5/12=33/60-25/12=8/60
8/9+7/54=48/54+7/54=55/54=1 1/54(одна целая одна пятьдесят четвертая)
5/6-17/21=35/42-34/42=1/42
3/16+1/24=9/48+2/48=11/48
5/6-22/27=45/54-44/54=1/54
7/25-4/15=21/75-20/75=1/75
3/10+1/6=9/30+5/30=14/30
2/5-11/30=12/30-11/30=1/30
3/8+7/20=15/40+14/40=29/40
1/6-1/7=7/42-6/42=1/42
5/9+7/15=25/45+21/45=46/45=1_1/45
3/8+19/56=21/56+19/56=40/46
19/45-7/18=38/90-35/90=3/90
1/4-1/8=2/8-1/8=1/8
11/14+8/21=33/42+16/42=49/42=1_7/42
Пошаговое объяснение: