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$\frac{1}{5} + \frac{17}{20} = \frac{4}{20} + \frac{17}{20} = \frac{21}{20} = 1\frac{1}{20}$

$\frac{1}{7} - \frac{1}{14} = \frac{2}{14} - \frac{1}{14} = \frac{1}{14}$

$\frac{3}{10} + \frac{3}{4} = \frac{6}{20} + \frac{15}{20} = \frac{21}{20} = 1 \frac{1}{20}$

$\frac{28}{57} - \frac{3}{19} = \frac{28}{57} - \frac{9}{57} = \frac{19}{57} = \frac{1}{3}$

$\frac{2}{25} + 0.02 = \frac{8}{100} \times 0.02 = 0.08 + 0.02 =$
=0,1