1. Блок 1: 1/10 + 29/20. Блок 2: 21/5 · 3/7. Блок 3: (9/10 − 7/15) · 3.

Блок 1: \(\frac{1}{10}+\frac{29}{20}=\frac{2}{20}+\frac{29}{20}=\frac{31}{20}\).

Блок 2: \(\frac{21}{5}\cdot\frac{3}{7}=\frac{9}{5}\).

Блок 3: \(\left(\frac{9}{10}-\frac{7}{15}\right)\cdot3=\left(\frac{27}{30}-\frac{14}{30}\right)\cdot3=\frac{13}{10}\).

Ответ: \(\frac{31}{20};\ \frac{9}{5};\ \frac{13}{10}\).