Помогите решить номер 617

Решите задачу:

$1) \frac{7}{16} + \frac{1}{4} = \frac{7}{16} + \frac{4}{16} = \frac{11}{16} \\ \\ 2) \frac{25}{36} - \frac{2}{9} = \frac{25}{36} - \frac{8}{36} = \frac{17}{36} \\ \\ 3) \frac{7}{12} - \frac{5}{24} = \frac{14-5}{24} = \frac{9}{24} = \frac{3}{8} \\ \\ 4) \frac{5}{7} - \frac{11}{21} = \frac{15-11}{21} = \frac{4}{21} \\ \\ 5) \frac{1}{6} + \frac{5}{18} = \frac{3}{18} + \frac{5}{18} = \frac{8}{18} = \frac{4}{9} \\ \\ 6) \frac{19}{45} + \frac{4}{15} = \frac{19+12}{45} = \frac{31}{45}$

$7) \frac{15}{16} - \frac{3}{32} = \frac{30-3}{32} = \frac{27}{32} \\ \\ 8) \frac{7}{15} + \frac{1}{3} = \frac{7+5}{15} = \frac{12}{15} = \frac{4}{5} \\ \\ 9) \frac{11}{13} - \frac{20}{39} = \frac{33-20}{39} = \frac{13}{39} = \frac{1}{2} \\ \\ 10) \frac{3}{50} + \frac{18}{25} = \frac{3+36}{50} = \frac{39}{50} \\ \\ 11) \frac{43}{62} - \frac{10}{31} = \frac{43-20}{62} = \frac{23}{62} \\ \\ 12) \frac{29}{64} + \frac{3}{8} = \frac{29+24}{64} = \frac{56}{64}$