Евгений8 лет назад
1) 6 7/15 - 3 1/5 = (6 * 15 + 7)/15 - (3 * 5 + 1)/5 = (90 + 7)/15 - (15 + 1)/5 = 97/15 - 16/5 = 97/15 - 3 * 16/15 = (97 - 48)/15 = 49/15;
Ответ: 49/15.
2) 16 2/5 - 4 3/7 = (16 * 5 + 2)/5 - (4 * 7 + 3)/7 = (80 + 2)/5 - (28 + 3)/7 = 82/5 - 31/7 = 7 * 82/35 - 5 * 31/35 = 574/35 - 155/35 = (574 - 155)/35 = 419/35;
Ответ: 419/35.