Ребят помогите , вот эти 2 столбика

Решите задачу:

$8 \frac{4}{5} +1 \frac{1}{3} =(8+1)+( \frac{4}{5} + \frac{1}{3} )=9+( \frac{12}{15} + \frac{5}{15})= \\ \\ =9+ \frac{17}{15} =9+1 \frac{2}{15}=10 \frac{2}{15} \\ \\ 12 \frac{5}{6} + \frac{4}{15} =12+( \frac{5}{6} + \frac{4}{15} )=12+( \frac{25}{30} + \frac{8}{30} ) \\ \\ =12+ \frac{33}{30} =12+1 \frac{3}{30} =13 \frac{3}{30} =13 \frac{1}{10}$
$2 \frac{3}{4} +1 \frac{2}{3} =(2+1)+ (\frac{3}{4} + \frac{2}{3} )= \\ \\ 3+( \frac{9}{12} + \frac{8}{12} )=3+ \frac{17}{12} =3+1 \frac{5}{12} =4 \frac{5}{12} \\ \\ \frac{7}{20} +8 \frac{3}{4} =8+( \frac{7}{20} + \frac{3}{4})=8+( \frac{7}{20} + \frac{15}{20} )=8+ \frac{22}{20} = \\ \\ 8+1 \frac{2}{20} =9 \frac{2}{20} =9 \frac{1}{10}$

$8 \frac{3}{5} +1 \frac{9}{10} =8 \frac{6}{10} +1 \frac{9}{10} =9 \frac{15}{10} =10 \frac{5}{10} =10 \frac{1}{2} \\ \\$

$6 \frac{2}{3} +8 \frac{5}{7} =(6+8)+( \frac{2}{3} + \frac{5}{7} )=14+ (\frac{14}{21} + \frac{15}{21} )=14 \frac{29}{21} =15 \frac{8}{21}$