Ответ: 1) 5/8 + 7/8 — 1/8 = 11/8 = 1 3/8 2) 5/9 — ( 4/9 — 1/9 ) = 5/9 — 3/9 = 2/9 3) 4 4/33 + 3 7/33 = 7 11/33 = 7 1/3 4) 5 13/18 — 2 7/18 = 3 6/18 = 3 1/3