Question

1914 7/12+2 2/7 : 1 1/7-3/8*1 5/9=
ДУЖЕ ТЕРМІНОВО ДАЮ 30 БАЛІВ

Answer 1

Ответ:1257/349.

смотри!
7/12 = (12 * 1 + 7) / 12 = 19/12
2/7 = (7 * 1 + 2) / 7 = 16/7 1 1/7 = (7 * 1 + 1) / 7 = 8/7
1 5/9 = (9 * 1 + 5) / 9 = 14/9

3/8 * 14/9 = (3 * 14) / (8 * 9) = 42/72 = 7/12

19/12 + 16/7 = (19 * 7 + 16 * 12) / (12 * 7) = (133 + 192) / 84 = 325/84

8/7 - 7/12 = (8 * 12 - 7 * 7) / (7 * 12) = (96 - 49) / 84 = 47/84 = 11/24

325/84 - 7/12 * 11/24 = 325/84 - 77/288 = (325 * 288 - 77 * 84) / (84 * 288) = (93600 - 6468) / 24192 = 87132/24192 = 1257/349.