решите пример с дробями: (18 2\7 - 19) * 4 1\5 (9 3\8 - 11) * 4\13

1) 18 2/7 - 19 - 18 2/7 - 18 7/7 = 5/72) 9 3/8 - 11 = -(10 8/8 - 9 3/8) = -1 5/83) 5/7 * 4 1/5 = 5/7 * 21/5 = 1/1 * 3/1 = 34) -1 5/8 * 4/13 = -( 13/5 * 4/13) = -( 1/5 * 4/1) = -4/55) 3 * (-4/5) = -( 3/1 * 4/5) = -12/5 = -2 2/5Ответ: - 2 2/5