9) \frac{5}{8} + \frac{7}{8} 10) \frac{2}{25} + \frac{13}{25} 11) \frac{4}{5} + \frac{2}{5} 12) \frac{7}{13} + \frac{6}{13} 13) \frac{5}{7} + \frac{4}{7} 14) \frac{7}{10} + \frac{9}{10} 15) \frac{1}{8} + \frac{3}{8} 16) \frac{12}{19} + \frac{7}{19} 17) \frac{5}{9} + \frac{1}{9} 18) \frac{11}{18} + \frac{13}{18} 19) \frac{5}{6} + \frac{1}{6} 20) \frac{1}{14} + \frac{5}{14}

9) \(\frac{5}{8} + \frac{7}{8} = \frac{5+7}{8} = \frac{12}{8} = \frac{3}{2} = 1\frac{1}{2}\)

10) \(\frac{2}{25} + \frac{13}{25} = \frac{2+13}{25} = \frac{15}{25} = \frac{3}{5}\)

11) \(\frac{4}{5} + \frac{2}{5} = \frac{4+2}{5} = \frac{6}{5} = 1\frac{1}{5}\)

12) \(\frac{7}{13} + \frac{6}{13} = \frac{7+6}{13} = \frac{13}{13} = 1\)

13) \(\frac{5}{7} + \frac{4}{7} = \frac{5+4}{7} = \frac{9}{7} = 1\frac{2}{7}\)

14) \(\frac{7}{10} + \frac{9}{10} = \frac{7+9}{10} = \frac{16}{10} = \frac{8}{5} = 1\frac{3}{5}\)

15) \(\frac{1}{8} + \frac{3}{8} = \frac{1+3}{8} = \frac{4}{8} = \frac{1}{2}\)

16) \(\frac{12}{19} + \frac{7}{19} = \frac{12+7}{19} = \frac{19}{19} = 1\)

17) \(\frac{5}{9} + \frac{1}{9} = \frac{5+1}{9} = \frac{6}{9} = \frac{2}{3}\)

18) \(\frac{11}{18} + \frac{13}{18} = \frac{11+13}{18} = \frac{24}{18} = \frac{4}{3} = 1\frac{1}{3}\)

19) \(\frac{5}{6} + \frac{1}{6} = \frac{5+1}{6} = \frac{6}{6} = 1\)

20) \(\frac{1}{14} + \frac{5}{14} = \frac{1+5}{14} = \frac{6}{14} = \frac{3}{7}\)

Ответ: смотри выше