Вопрос:

Ответ:

\[6\frac{15}{21} + 2\frac{9}{14} = 6\frac{5^{\backslash 2}}{7} + 2\frac{9}{14} = 8\frac{10 + 9}{14} =\]

\[= 8\frac{19}{14} = 9\frac{5}{14}\]