Сравните дроби: 3/8 и 1/6; 5/8 и 7/10; 3/7 и 9/21; 3/5 и 5/8; 7/12 и 11/18; 10/21 и 9/14;

Для сравнения дробей надо привести их к общему знаменателю. 3/8 и 1/6 --- общий знаменатель 24 9/24 и 4/24 ----- 9/24 > 4/24 3/8 > 1/6 -------------------------------------------- 5/8 и  7/10  ---- общ. знам. = 40 25/40 и 28/40 ----- 25/40 < 28/40 5/8 < 7/10 ------------------------------------------- 3/7 и 9/21 ---- общ.знам. = 21 9/21 = 9/21 3/7 = 9/21 ---------------------------------------- 3/5 и 5/8 -----общ.знам. = 40 24/40  и 25/40 ----24/40 < 25/40 3/5 < 5/8 ------------------------------------------ 7/12 и 11/18 ------общ.знам. = 36 21/36 и 22/36----21/36< 22/36 7/12 < 11/18 ---------------------------------------- 10/21  и 9/14 ----общ.знам. = 42 20/42 и 27/42 ---- 20/42 < 27/42 10/21 < 9/14