Помогите пожалуйста решить примеры(дроби)!!!б,д,з,л

1. [latex] \frac{2}{9} + \frac{5}{6} = \frac{4+5}{18} = \frac{19}{18} = 1\frac{1}{18} [/latex] 2. [latex] \frac{3}{10} + \frac{2}{12} = \frac{18+10}{60} = \frac{28}{60} = \frac{7}{15} [/latex] 3. [latex] \frac{2}{26} + \frac{3}{39} = \frac{1+1}{13} = \frac{2}{13} [/latex] 4. [latex] \frac{7}{450} + \frac{8}{180} = \frac{7+20}{450} = \frac{27}{450} = \frac{3}{50} [/latex]