Пошаговое объяснение:
1) 2/3 + 5/7 = 14/21 + 15/21 = 29/21
2) 29/21 * 42 = 29 * 2 / 1 = 58/1 = 58
3) 58 * 32/5 = 1856/5
4) 1856/5 : 1/9 = 1856/5 * 9/1 = 16704/5 = 3340,8
3340 4/5
(2/3+5/7)*42*32/5:1/9 = (14/21+15/21)*42*32/5:1/9= 29/21*42*32/5:1/9= 58*32/5:1/9 = 1856/5 : 1/9 = 3340 4/5
