(3 2/3 + 1 3/4) = 3 + 2/3 + 1 + 3/4 = 4 + 8/12 + 9/12 = 4 + 17/12 = 5 5/12. (6 7/12 − 2 1/4) = 6 + 7/12 − 2 − 3/12 = 4 + 4/12 = 4 1/3 = 13/3. (13/3) × 0,8 = 10,4/3. Выражение: (5 5/12) ÷ (10,4/3) = (65/12) ÷ (31,2/3) = (65/12) × (3/31,2) = 195/374,4 = 65/124,8 = 13/24,96.