1 0,35-20-

$$0.35 - \frac{1}{20} = \frac{35}{100} - \frac{1}{20} = \frac{35}{100} - \frac{1 \cdot 5}{20 \cdot 5} = \frac{35}{100} - \frac{5}{100} = \frac{30}{100} = \frac{3}{10} = 0.3$$

Ответ: 0.3