Вычислите (3/8+5/12)*4 (5/6-2/9):11

1) (3/8 + 5/12) * 4 = ((3 * 3)/(8 * 3) + (5 * 2)/(12 * 2)) * 4 = (9/24 + 10/24) * 4 = 19/24 * 4 = (19 * 4)/24 = (19 * 1)/6 = 19/6 = 3 1/6. Ответ: 3 1/6; 2) (5/6 - 2/9) : 11 = ((5 * 3)/(6 * 3) - (2 * 2)/(9 * 2)) : 11 = (15/18 - 4/18) : 11 = 11/18 : 11 = 11/18 *1/11 = (11 * 1)/(18 * 11) = (1 * 1)/(18 * 1) = 1/18. Ответ: 1/18.