5.539 Найдите значение выражения: a) \(\frac{6}{18} \div \frac{2}{2}\); б) \(\frac{21}{11} \div \frac{22}{3}\); в) \((\frac{3}{10} + \frac{1}{2}) \div \frac{3}{2}\)?

a) \(\frac{6}{18} \div \frac{2}{2} = \frac{6}{18} \div 1 = \frac{6}{18} = \frac{1}{3}\) б) \(\frac{21}{11} \div \frac{22}{3} = \frac{21}{11} \cdot \frac{3}{22} = \frac{21 \cdot 3}{11 \cdot 22} = \frac{63}{242}\) в) \((\frac{3}{10} + \frac{1}{2}) \div \frac{3}{2} = (\frac{3}{10} + \frac{5}{10}) \div \frac{3}{2} = \frac{8}{10} \div \frac{3}{2} = \frac{8}{10} \cdot \frac{2}{3} = \frac{16}{30} = \frac{8}{15}\)