Сравните дроби 1/7 и 4/21, 3/5 и 8/15 ,3/5 и 11/20, 4/7 и 16/28 , 4/9 и 8/15 , 5/12 и...

Question

Сравните дроби 1/7 и 4/21, 3/5 и 8/15 ,3/5 и 11/20, 4/7 и 16/28 , 4/9 и 8/15 , 5/12 и 7/18, 37/115 и 38/175, 9/65 и 16/117

Answer 1

Приводим дроби к НОЗ и сравниваем

▪1/7 < 4/21, т.к. 3/21 < 4/21
▪3/5 > 8/15 , т.к. 9/15 > 8/15
▪3/5 > 11/20, т.к. 12/20 > 11/20
▪4/7 = 16/28 , т.к. 4/7 = 4/7 (сокращаем 2 дробь на 4)
▪4/9 < 8/15 , т.к. 20/45 < 24/45
▪5/12 > 7/18, т.к. 15/36 > 14/36
▪37/115 > 38/175, т.к. 1295/4025 > 874/4025
▪9/65 > 16/117 т.к. 81/585 > 80/585