Вправи 201 - 300 » 286

Виконайте дії: 1) 172/3 – 61/36 + 43/8 = 15 + (2/3 – 1/36 + 3/8) = 15 + (2 • 24 - 1 • 2 + 3 • 9)/72 = 1573/72 = 161/72. 2) 109/16 – (311/12 + 44/9) = 109/16 – (7 + (11/12 + 4/9)) = 109/16 – (7 + (11 • 3 + 4 • 4)/36) = 109/16 – 749/36 = 109/16 – 813/36 = 2 + (9/16 – 13/36 ) = 2 + (9 • 9 - 13 • 4)/144 = 229/144.