7. Блок 1: \(\frac{1}{10}-\frac{23}{20}\). Блок 2: \(\frac{3}{5}\cdot\frac{25}{4}\). Блок 3: \(\left(\frac{9}{17}-\frac{11}{34}\right)\cdot\frac{17}{2}\).

Блок 1: \(\frac{1}{10}-\frac{23}{20}=\frac{2}{20}-\frac{23}{20}=-\frac{21}{20}\).

Блок 2: \(\frac{3}{5}\cdot\frac{25}{4}=\frac{75}{20}=\frac{15}{4}\).

Блок 3: \(\left(\frac{9}{17}-\frac{11}{34}\right)\cdot\frac{17}{2}=\left(\frac{18}{34}-\frac{11}{34}\right)\cdot\frac{17}{2}=\frac{7}{34}\cdot\frac{17}{2}=\frac{7}{4}\).

Ответ: Блок 1 — \(-\frac{21}{20}\); Блок 2 — \(\frac{15}{4}\); Блок 3 — \(\frac{7}{4}\).