Question

2 1/2k=4 1/2 *1 1/9

Answer 1

$2 \frac{1}{2k} = 4 \frac{1}{2} \times \frac{11}{9} \\ \frac{7}{2k} = \frac{9}{2} \times \frac{11}{9} \\ \frac{2}{7k} = \frac{9 \times 11}{2 \times 9} = \frac{11}{2} \\ k = \frac{11}{2} \div \frac{2}{7} \\ k = \frac{11 \times 7}{2 \times 2} = \frac{77}{4} = 19.2$
Вроде всё. Удачи!!!!!