Ответы: 1
Taras Berdyugin
2017-11-14 19:16
81/88 * (6 — 1 13/15 * 1 19/21) = 2 целых 1/4 1) 1 13/15 * 1 19/21 = 28/15 * 40/21 = (4*8)/(3*3) = 32/9 2) 6 — 32/9 = 54/9 — 32/9 = 22/9 3) 81/88 * 22/9 = (9*2)/(8*1) = 18/8 = 2 2/8 = 2 1/4