Приведи к наименшему общему знаменателю 9/10и 1/20, 2/3и 7/12, 1/2и1/3, 3/5и

9/10 и 1/20 = (9 * 2)/(10 * 2) и 1/20 = 18/20 и 1/20; 

2/3 и 7/12 = (2 * 4)/(3 * 4) и 7/12 = 8/11 и 7/12; 

1/2 и 1/3 = (1 * 3)/(2 * 3) и (1 * 2)/(3 * 2) = 3/6 и 2/6; 

3/5 и 2/3 = (3 * 3)/(5 * 3) и (2 * 5)/(3 * 5) = 3/15 и 10/15; 

2/7 и 8/11 = (2 * 11)/(7 * 11) и (8 * 7)/(7 * 11) = 22/77 и 56/77; 

5/4 и 3/2 = 5/4 и (3 * 2)/(2 * 2) = 5/4 и 6/4; 

1/6 и 3/10 = (1 * 5)/(6 * 5) и (3 * 3)/(10 * 3) = 5/30 и 9/30; 

3/10 и 33/100 = (3 * 10)/(10 * 10) и 33/100 = 30/100 и 33/100.