Ответ:
Расставим действия:
4 5 1 2 3
1 31/32 * 3 1/5 + (8 5/9 * 6/35 + 3 8/15) * 7/50 = 63/10 + (22/15 + 53/15) * 7/50 = 63/10 +
+ 5 * 7/50 = 63/10 + 7/10 = 7.
1) 8 5/9 * 6/35 = 77/9 * 6/35 = 11/3 * 2/5 = 22/15;
2) 22/15 + 3 8/15 = 22/15 + 53/15 = 75/15 = 5;
3) 5 * 7/50 = 35/50 = 7/10;
4) 1 31/32 * 3 1/5 = 63/32 * 16/5 = 63/2 * 1/5 = 63/10;
5) 63/10 + 7/10 = 70/10 = 7.