Вычислите: 1)11/12-1/20-1/30 2)2/3-5/24-3/10 3)4/5-4/45-7/25

11/12 - 1/20 - 1/30=55/60 - 3/60 - 2/60=50/60=5/6

2/3 - 5/24 - 3/10=80/120 - 25/120 - 36/120=19/120

4/5 - 4/45 - 7/25=36/45 - 4/45 - 7/25=32/45 - 7/25=160/225 - 63/225=97/225