Выполните действие: 1) 7/12+ 7/20 2) 3/8+ 1/18 3) 1/12 +11/14 4) 2/15 -7/12 5) 9/14 - 5/12 6) 19/75 + 7/50

1) 7/12 + 7/20 = (7 * 5 + 7 * 3)/60 = (35 + 21)/60 = 56/60 = 14/15;Ответ: 14/15.2) 3/8 + 1/18 = (3 * 9 + 1 * 4)/72 = (27 + 4)/72 = 31/72;Ответ: 31/72.3) 1/12 + 11/14 = (1 * 14 + 11 * 12)/168 = (14 + 132)/168 = 146/168 = 73/84;Ответ: 73/84.4) 2/15 - 7/12 = (2 * 4 - 7 * 5)/60 = (8 - 35)/60 = -27/60 = -9/20;Ответ: - 9/20.5) 9/14 - 5/12 = (9 * 12 - 5 * 14)/168 = (108 - 70)/168 = 38/168 = 19/84;Ответ: 19/84.6) 19/75 + 7/50 = (19 * 2 + 7 * 3)/150 = (38 + 21)/150 = 59/150.Ответ: 59/150.