Вычислите: 1) $$5\frac{7}{18} - \frac{3}{4}$$ 2) $$5\frac{4}{15} - 2\frac{5}{20}$$

1) $$5\frac{7}{18} - \frac{3}{4} = 5 + \frac{7}{18} - \frac{3}{4} = 5 + \frac{7 \cdot 2}{18 \cdot 2} - \frac{3 \cdot 9}{4 \cdot 9} = 5 + \frac{14}{36} - \frac{27}{36} = 5 - \frac{13}{36} = 4 + 1 - \frac{13}{36} = 4 + \frac{36}{36} - \frac{13}{36} = 4\frac{23}{36}$$ 2) $$5\frac{4}{15} - 2\frac{5}{20} = 5\frac{4}{15} - 2\frac{1}{4} = 5 + \frac{4}{15} - 2 - \frac{1}{4} = 3 + \frac{4}{15} - \frac{1}{4} = 3 + \frac{4 \cdot 4}{15 \cdot 4} - \frac{1 \cdot 15}{4 \cdot 15} = 3 + \frac{16}{60} - \frac{15}{60} = 3 + \frac{1}{60} = 3\frac{1}{60}$$