1 2/7 · 1 3/4 =

\(1\frac{2}{7}=\frac{9}{7}\), \(1\frac{3}{4}=\frac{7}{4}\).

\(\frac{9}{7}\cdot\frac{7}{4}=\frac{9}{4}=2\frac{1}{4}\).

Ответ: 2 1/4.