Срочнооо помогитесли дам 50б

Решите задачу:

$1) \frac{2}{5} + \frac{1}{4} = \frac{8+5}{20} = \frac{13}{20} \\ 2) \frac{4}{7} + \frac{2}{3} = \frac{12+14}{21} = \frac{26}{21}=1 \frac{5}{21} \\ 3) \frac{3}{11} + \frac{1}{2} = \frac{6+11}{22} = \frac{17}{22} \\ 4) \frac{2}{5} + \frac{3}{8} = \frac{16+15}{40} = \frac{31}{40} \\ 5) \frac{3}{7} + \frac{4}{5} = \frac{15+28}{35} = \frac{43}{35} =1 \frac{8}{35} \\ 6) \frac{2}{9} + \frac{1}{5} = \frac{10+9}{45} = \frac{19}{45}$