1) 15 4/9 - 4 4/9 * 3 3/8 = 15 4/9 - 40/9 * 27/8 = 15 4/9 - 15 = 4/9 . Ответ : 4/9 . 2) 81/88 * (6 - 1 13/15 * 1 19/21) = 81/88 * (6 - 28/15 * 40/21) = 81/88 * (6 - 4/3 * 8/3) = 81/88 * (6 - 32/9) = 81/88 * (54/9 - 32/9) = 81/88 * 22/9 = 9/4 = 2 1/4 . Ответ : 2 1/4. 3) (5 1/16 - 1 1/8) * (5/6 + 3/14) = (81/16 - 9/8) * (5/6 + 3/14) = (81 * 1 - 9 * 2)/16 * (5 * 7 + 3 * 3)/42 = (81 - 18)/16 * (35 + 9)/42 = 63/16 * 44/42 = 63/16 * 22/21 = 3/8 * 11 = 33/8 = 4 1/8 . Ответ : 4 1/8 . /112.