Найдите значение выражения: а) 1 3/5 : 9/16 : 2 1/4; б) 3/2 : (1/2 − 4/11); в) 1 1/5 : (2/3 − 1 1/15); г) 28 · (27/28 − 3/7).

1. \(1\frac{3}{5}:\frac{9}{16}:2\frac{1}{4}=\frac{8}{5}\cdot\frac{16}{9}\cdot\frac{4}{9}=\frac{512}{405}=1\frac{107}{405}\).
2. \(\frac{3}{2}:\left(\frac{1}{2}-\frac{4}{11}\right)=\frac{3}{2}:\frac{3}{22}=11\).
3. \(1\frac{1}{5}:\left(\frac{2}{3}-1\frac{1}{15}\right)=\frac{6}{5}:\left(\frac{10}{15}-\frac{16}{15}\right)=\frac{6}{5}:\left(-\frac{2}{5}\right)=-3\).
4. \(28\cdot\left(\frac{27}{28}-\frac{3}{7}\right)=28\cdot\left(\frac{27}{28}-\frac{12}{28}\right)=28\cdot\frac{15}{28}=15\).

Ответ: а) \(1\frac{107}{405}\); б) \(11\); в) \(-3\); г) \(15\).