2. Сравните: 1) 5/21 и 3/14; 2) 5/16 и 3/8; 3) 5/10 и 1/4

Для сравнения дробей, приведем их к общему знаменателю: 1) 5/21 и 3/14: * НОК(21, 14) = 42 * 5/21 = (5 * 2) / (21 * 2) = 10/42 * 3/14 = (3 * 3) / (14 * 3) = 9/42 * 10/42 > 9/42 => 5/21 > 3/14 2) 5/16 и 3/8: * НОК(16, 8) = 16 * 5/16 = 5/16 * 3/8 = (3 * 2) / (8 * 2) = 6/16 * 5/16 < 6/16 => 5/16 < 3/8 3) 5/10 и 1/4: * НОК(10, 4) = 20 * 5/10 = (5 * 2) / (10 * 2) = 10/20 * 1/4 = (1 * 5) / (4 * 5) = 5/20 * 10/20 > 5/20 => 5/10 > 1/4 **Ответ:** 1) 5/21 > 3/14 2) 5/16 < 3/8 3) 5/10 > 1/4