Кнаименьшему общему знаменателю дроби: а) 1/8 и 3/4; 9/10 и 1/20; 2/3 и 7/12; 7/15 и 3/5 б)1/2 и 1/3; 2/5 и 3/4; 3/16 и 2/3; 1/5 и 9/25; в)7/15 и 5/9; 1/6 и 3/10; 5/12 им 7/15; 7/20 и 7/8.

1/8 и 3/4 = 1/8 и 6/8,
9/10 и 1/20 = 18/20 и 1/20
2/3 и 7/12 = 8/12 и 7/12
7/15 и 3/5 = 7/15 и 9/15
1/2 и 1/3 = 3/6 и 2/6
2/5 и 3/4 = 8/20 и 15/20
3/16 и 2/3 = 9/48 и 32/48
1/4 и 9/25 = 25/100 и 36/100
7/15 и 5/9 = 21/45 и 25/45
1/6 и 3/10 = 5/30 и 9/30
5/12 и 7/15 = 25/60 и 28/60
7/20 и 7/8 = 14/40 и 35/40