Помогите пожалуйста номер 395.спасибо.

З95.
а)
$\frac{5}{6} - \frac{3}{4} = \frac{20}{24} - \frac{18}{24} = \frac{2}{24} = \frac{1}{12}$
б)
$\frac{1}{3} + \frac{1}{5} = \frac{5}{15} + \frac{3}{15} = \frac{8}{15}$
в)
$\frac{3}{10} + \frac{1}{2} = \frac{3}{10} + \frac{5}{10} = \frac{8}{10} = \frac{4}{5} = 0.8$
Г)
$\frac{1}{3} - \frac{1}{7} = \frac{7}{21} - \frac{3}{21} = \frac{4}{21}$
Д)
$\frac{2}{9}$
е)
$\frac{9}{20} + \frac{3}{8} = \frac{18}{40} + \frac{15}{40} = \frac{33}{40}$
Ж)

$\frac{19}{75} - \frac{11}{50} = \frac{38}{150} - \frac{33}{150} = \frac{5}{150} = \frac{1}{30}$
З)
$\frac{13}{50} - \frac{17}{75} = \frac{39}{150} - \frac{34}{150} = \frac{5}{150} = \frac{1}{30}$
и)
$\frac{11}{14} + \frac{8}{21} = \frac{ 33}{42} + \frac{16}{42} = \frac{49}{42} = 1 \frac{7}{42} \\ = 1 \frac{1}{6}$
К)
$\frac{7}{15}$