44. 3 4/21−2 5/14

\(3\frac{4}{21}=\frac{67}{21}\), \(2\frac{5}{14}=\frac{33}{14}\).

\(\frac{67}{21}-\frac{33}{14}=\frac{134}{42}-\frac{99}{42}=\frac{35}{42}=\frac{5}{6}\).

Ответ: \(\frac{5}{6}\)