Дроби к общему знаменателю 1/30 и 1/40 1/30 и 1/50 1/70 и 1/60 1/50 и 1/80 1/60 и 1/15 1/24 и 1/120 3/50 и 7/25 7/200 и 11/40 8/17 и 9/34 3/40 и 7/25

4/120 и 3/120
5/150 и 3/150
6/420 и 7/420
8/400и 5/400
1/60 и 4/60
5/120 и 1/120
3/50 и 14/50
7/200 и 55/200
16/34 и 9/34
15/200 и 56/200