Николай7 лет назад
А) 1 1/35 * (7 - 5 4/9) = (1 * 35 + 1)/35 * (7 - (5 * 9 + 4)/9) = 36/35 * (7 - 49/9) = 36/35 * (63/9 - 49/9) = 36/35 * (63 - 49)/9 = 36/35 * 14/9 = (36 * 14)/(35 * 9) = (4 * 2)/5 = 8/5;
Ответ: 8/5.
Б) (4,5 : 1,8 – 1,05) * 2,4 = (45/10 * 10/18 - 105/100) * 24/10 = (50/20 - 21/20) * 12/5 = (50 - 21)/20 * 12/5 = 29/20 * 12/5 = (29 * 12)/(20 * 5) = (29 * 3)/(5 * 5) = 87/25;
Ответ: 87/25.