1) \(\frac{4}{15}\cdot\frac{15}{16}\) 2) \(3\frac{1}{3}-1\frac{1}{5}\) 3) \(\frac{1}{18}\cdot 39\)

1) \(\frac{4}{15}\cdot\frac{15}{16}\) = \(\frac{4\cdot15}{15\cdot16}\) = \(\frac{1}{4}\)

2) \(3\frac{1}{3}-1\frac{1}{5}\) = \(\frac{10}{3}-\frac{6}{5}\) = \(\frac{10 \cdot 5 - 6 \cdot 3}{15}\) = \(\frac{50-18}{15}\) = \(\frac{32}{15}\) = \(2\frac{2}{15}\)

3) \(\frac{1}{18}\cdot 39\) = \(\frac{39}{18}\) = \(\frac{13}{6}\) = \(2\frac{1}{6}\)

Ответ: 1) \(\frac{1}{4}\); 2) \(2\frac{2}{15}\); 3) \(2\frac{1}{6}\)