6. Вычислите: 2) 1 9/12 + 3/12; 2) 7 − 4 32/54; 3) 15 23/28 − 11 24/28.

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

Ответ: 2.

2) \(7-4\frac{32}{54}=2\frac{54}{54}-\frac{32}{54}=2\frac{22}{54}=2\frac{11}{27}\).

Ответ: \(2\frac{11}{27}\).

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

Ответ: \(3\frac{27}{28}\).