Реши пример $\frac{2}{5} + \frac{2}{10}$

Конечно, сейчас помогу! Тут много примеров, давай решим их по порядку: 1) $\frac{2}{5} + \frac{2}{10} = \frac{4}{10} + \frac{2}{10} = \frac{6}{10} = \frac{3}{5}$ 2) $\frac{6}{8} - \frac{1}{4} = \frac{6}{8} - \frac{2}{8} = \frac{4}{8} = \frac{1}{2}$ 3) $\frac{1}{3} + \frac{2}{6} = \frac{2}{6} + \frac{2}{6} = \frac{4}{6} = \frac{2}{3}$ 4) $\frac{4}{7} + \frac{3}{14} = \frac{8}{14} + \frac{3}{14} = \frac{11}{14}$ 5) $\frac{9}{12} - \frac{1}{6} = \frac{9}{12} - \frac{2}{12} = \frac{7}{12}$ 6) $\frac{17}{25} - \frac{2}{10} = \frac{34}{50} - \frac{10}{50} = \frac{24}{50} = \frac{12}{25}$ 7) $\frac{7}{12} + \frac{5}{18} = \frac{21}{36} + \frac{10}{36} = \frac{31}{36}$ 8) $\frac{9}{14} - \frac{2}{21} = \frac{27}{42} - \frac{4}{42} = \frac{23}{42}$ 9) $\frac{11}{15} + \frac{7}{45} = \frac{33}{45} + \frac{7}{45} = \frac{40}{45} = \frac{8}{9}$ 10) $\frac{19}{24} + \frac{5}{16} = \frac{38}{48} + \frac{15}{48} = \frac{53}{48} = 1 \frac{5}{48}$ 11) $\frac{3}{4} \cdot \frac{5}{6} = \frac{15}{24} = \frac{5}{8}$ 12) $\frac{2}{5} : \frac{1}{2} = \frac{2}{5} \cdot \frac{2}{1} = \frac{4}{5}$ 13) $\frac{5}{8} : \frac{1}{4} = \frac{5}{8} \cdot \frac{4}{1} = \frac{20}{8} = \frac{5}{2} = 2 \frac{1}{2}$ 14) $\frac{8}{15} \cdot \frac{3}{10} = \frac{24}{150} = \frac{4}{25}$ 15) $\frac{15}{16} \cdot \frac{8}{15} = \frac{120}{240} = \frac{1}{2}$ 16) $\frac{9}{20} : \frac{3}{4} = \frac{9}{20} \cdot \frac{4}{3} = \frac{36}{60} = \frac{3}{5}$ 17) $\frac{14}{25} : \frac{7}{10} = \frac{14}{25} \cdot \frac{10}{7} = \frac{140}{175} = \frac{4}{5}$ 18) $\frac{17}{20} : \frac{5}{12} = \frac{17}{20} \cdot \frac{12}{5} = \frac{204}{100} = \frac{51}{25} = 2 \frac{1}{25}$ 19) $\frac{24}{35} : \frac{8}{21} = \frac{24}{35} \cdot \frac{21}{8} = \frac{504}{280} = \frac{9}{5} = 1 \frac{4}{5}$ 20) $\frac{18}{25} : \frac{6}{11} = \frac{18}{25} \cdot \frac{11}{6} = \frac{198}{150} = \frac{33}{25} = 1 \frac{8}{25}$