Ответ:
Выполним действия:
1. (8 — 4 3/11) + 2 8/11 = 6 5/11;
1) 8 — 4 3/11 = 8 — 4 — 3/11 = 4 — 3/11 = 3 + 1 — 3/11 = 3 + 11/11 — 3/11 = 3 + (11 — 3)/11 = 3 + 8/11 = 3 8/11;
2) 3 8/11 + 2 8/11 = 3 + 2 + 8/11 + 8/11 = 5 + 8/11 + 8/11 = 5 + (8 + 8)/11 = 5 + 16/11 = 5 + 1 5/11 = 6 5/11.
2. 11 1/7 — (5 4/7 + 3 6/7) = 1 5/7;
1) 5 4/7 + 3 6/7 = 5 + 3 + 4/7 + 6/7 = 8 + 4/7 + 6/7 = 8 + (4 + 6)/7 = 8 + 10/7 = 8 + 1 3/7 = 9 3/7;
2) 11 1/7 — 9 3/7 = 11 — 9 + 1/7 — 3/7 = 2 + 1/7 — 3/7 = 2 + (1 — 3)/7 = 2 — 2/7 = 1 + 1 — 2/7 = 1 + 7/7 — 2/7 = 1 + (7 — 2)/7 = 1 + 5/7 = 1 5/7.