Вычислите:

1. $$ 5 + \frac{2}{10} + \frac{3}{10} = 5 + \frac{5}{10} = 5 + \frac{1}{2} = 5.5 $$ Ответ: 5.5
2. $$ \frac{12}{20} - \frac{7}{30} = \frac{36}{60} - \frac{14}{60} = \frac{22}{60} = \frac{11}{30} $$ Ответ: $$\frac{11}{30}$$
3. $$\frac{7}{8} + 6 - \frac{5}{24} = \frac{21}{24} + 6 - \frac{5}{24} = 6 + \frac{16}{24} = 6 + \frac{2}{3} = 6\frac{2}{3}$$ Ответ: $$6\frac{2}{3}$$
4. $$\frac{15}{16} - \frac{15}{32} + \frac{51}{64} = \frac{60}{64} - \frac{30}{64} + \frac{51}{64} = \frac{81}{64} = 1\frac{17}{64}$$ Ответ: $$1\frac{17}{64}$$