Решение:
- \( 4 \cdot \frac{2}{41} = \frac{4 \cdot 2}{41} = \frac{8}{41} \)
- \( 6 \cdot \frac{7}{18} = \frac{6 \cdot 7}{18} = \frac{42}{18} = \frac{7}{3} \)
- \( \frac{5}{14} \cdot 28 = \frac{5 \cdot 28}{14} = 5 \cdot 2 = 10 \)
Ответ: 1) \( \frac{8}{41} \); 2) \( \frac{7}{3} \); 3) 10.