6. Блок 1: 1/4 − 3/25. Блок 2: 6/5 : 4/11. Блок 3: (8/11 − 5/22) · 11/5.

Блок 1. Приводим к знаменателю 100: \(\frac{1}{4}-\frac{3}{25}=\frac{25}{100}-\frac{12}{100}=\frac{13}{100}\).

Блок 2. \(\frac{6}{5}:\frac{4}{11}=\frac{6}{5}\cdot\frac{11}{4}=\frac{66}{20}=\frac{33}{10}\).

Блок 3. \(\left(\frac{8}{11}-\frac{5}{22}\right)\cdot\frac{11}{5}=\left(\frac{16}{22}-\frac{5}{22}\right)\cdot\frac{11}{5}=\frac{11}{22}\cdot\frac{11}{5}=\frac{11}{10}\).