Решение:
- \(\frac{9}{14} \cdot 28 = \frac{9 \cdot 28}{14} = 9 \cdot 2 = 18\)
- \(6\frac{3}{4} \cdot \frac{11}{45} = \frac{27}{4} \cdot \frac{11}{45} = \frac{27 \cdot 11}{4 \cdot 45} = \frac{3 \cdot 11}{4 \cdot 5} = \frac{33}{20} = 1\frac{13}{20}\)
- \(2\frac{1}{3} \cdot 6 = \frac{7}{3} \cdot 6 = \frac{7 \cdot 6}{3} = 7 \cdot 2 = 14\)
Ответ: 1) 18; 2) \(1\frac{13}{20}\); 3) 14.