9 21,3; 13

$$2\frac{9}{13} \cdot 1,3 = \frac{2 \cdot 13 + 9}{13} \cdot 1,3 = \frac{26+9}{13} \cdot \frac{13}{10} = \frac{35}{13} \cdot \frac{13}{10} = \frac{35}{10} = \frac{7 \cdot 5}{2 \cdot 5} = \frac{7}{2} = 3\frac{1}{2} = 3,5$$

Ответ: 3,5