2. Найдите значение выражения: а) \(\frac{11}{15}-\frac{4}{10}+\frac{1}{15}\); б) \(7-4\frac{5}{9}\); в) \(4\frac{3}{10}+1\frac{5}{12}\); г) \(6\frac{15}{21}+2\frac{9}{14}\); д) \(5\frac{1}{6}-3\frac{3}{4}\).

а) \(\frac{11}{15}+\frac{1}{15}-\frac{4}{10}=\frac{12}{15}-\frac{2}{5}=\frac{4}{5}-\frac{2}{5}=\frac{2}{5}\).

б) \(7-4\frac{5}{9}=6\frac{9}{9}-4\frac{5}{9}=2\frac{4}{9}\).

в) \(4\frac{3}{10}+1\frac{5}{12}=5+\frac{18}{60}+\frac{25}{60}=5\frac{43}{60}\).

г) \(6\frac{15}{21}+2\frac{9}{14}=6\frac{10}{14}+2\frac{9}{14}=8\frac{19}{14}=9\frac{5}{14}\).

д) \(5\frac{1}{6}-3\frac{3}{4}=4\frac{14}{12}-3\frac{9}{12}=1\frac{5}{12}\).

Ответ: а) \(\frac{2}{5}\); б) \(2\frac{4}{9}\); в) \(5\frac{43}{60}\); г) \(9\frac{5}{14}\); д) \(1\frac{5}{12}\).