Ответ:
\(\frac{1}{4}+\frac{1}{3}=\frac{7}{12}\), а \(8\frac{1}{9}+4\frac{2}{7}=\frac{781}{63}\).
\(\frac{7}{12}+\frac{781}{63}=\frac{3271}{252}=12\frac{247}{252}\).
Ответ: \(12\frac{247}{252}\).
\(\frac{1}{4}+\frac{1}{3}=\frac{7}{12}\), а \(8\frac{1}{9}+4\frac{2}{7}=\frac{781}{63}\).
\(\frac{7}{12}+\frac{781}{63}=\frac{3271}{252}=12\frac{247}{252}\).
Ответ: \(12\frac{247}{252}\).