6. Вычислите: 1) 1 9/12 + 3/12; 2) 7 − 4 33/64; 3) 15 23/28 − 11 24/28.

1) \(1\frac{9}{12}+\frac{3}{12}=1+\frac{12}{12}=2\).

2) \(7-4\frac{33}{64}=6\frac{64}{64}-4\frac{33}{64}=2\frac{31}{64}\).

3) \(15\frac{23}{28}-11\frac{24}{28}=14\frac{51}{28}-11\frac{24}{28}=3\frac{27}{28}\).

Ответ: 1) 2; 2) \(2\frac{31}{64}\); 3) \(3\frac{27}{28}\).