e) \(\frac{81}{115} \cdot \frac{46}{81}\) = \(\frac{81 \cdot 46}{115 \cdot 81}\) = \(\frac{46}{115}\) = \(\frac{2 \cdot 23}{5 \cdot 23}\) = \(\frac{2}{5}\)
Ответ: \(\frac{2}{5}\)