1. Вычислите: 1) 11 20 − 5 12 2) 7 12 − 3 9 5 1 4 3) 6 16 − 3 6 + 3 24

1) \(\frac{11}{20} - \frac{5}{12} = \frac{11 \cdot 3}{20 \cdot 3} - \frac{5 \cdot 5}{12 \cdot 5} = \frac{33}{60} - \frac{25}{60} = \frac{33-25}{60} = \frac{8}{60} = \frac{2}{15}\)

Ответ: \(\frac{2}{15}\)

2) \(\frac{7}{12} - \frac{3}{9} = \frac{7}{12} - \frac{1}{3} = \frac{7}{12} - \frac{1 \cdot 4}{3 \cdot 4} = \frac{7}{12} - \frac{4}{12} = \frac{7-4}{12} = \frac{3}{12} = \frac{1}{4}\)

Ответ: \(\frac{1}{4}\)

3) \(6\frac{5}{16} - 3\frac{1}{6} + 3\frac{4}{24} = 6\frac{5}{16} - 3\frac{1}{6} + 3\frac{1}{6} = 6\frac{5}{16} = 6\frac{5}{16}\)

Ответ: \(6\frac{5}{16}\)