Ответ:
\(\frac{23}{24}+5\frac{21}{24}+7=12+\frac{23+21}{24}=12+\frac{44}{24}=12+1\frac{5}{6}=13\frac{5}{6}\).
\(\frac{3}{9}+5\frac{7}{9}=5+\frac{3+7}{9}=5+\frac{10}{9}=6\frac{1}{9}\).
Ответ: \(13\frac{5}{6};\ 6\frac{1}{9}\).
\(\frac{23}{24}+5\frac{21}{24}+7=12+\frac{23+21}{24}=12+\frac{44}{24}=12+1\frac{5}{6}=13\frac{5}{6}\).
\(\frac{3}{9}+5\frac{7}{9}=5+\frac{3+7}{9}=5+\frac{10}{9}=6\frac{1}{9}\).
Ответ: \(13\frac{5}{6};\ 6\frac{1}{9}\).