Question

Помогите, пожалуйста!

Answer 1

$1)5 \frac{25}{100} - 5 \frac{1}{20} = \frac{525}{100} - \frac{101}{20} = \frac{525 - 505}{100} = \frac{20}{100} = \frac{1}{5} \\ 2) \frac{2}{10} + \frac{4}{5} = \frac{2 + 8}{10} = \frac{10}{10} = 1 \\ 3) \frac{1}{5} \div 1 = \frac{1}{5}$