Выполните умножение:
1) $\frac{2}{13} * 5$;
2) $\frac{4}{17} * 3$;
3) $\frac{8}{9} * 2$;
4) $\frac{4}{49} * 7$;
5) $7 * \frac{3}{40}$;
6) $6 * \frac{15}{18}$;
7) $\frac{7}{12} * 24$;
8) $45 * \frac{8}{15}$.
$\frac{2}{13} * 5 = \frac{2}{13} * \frac{5}{1} = \frac{10}{13}$
$\frac{4}{17} * 3 = \frac{4}{17} * \frac{3}{1} = \frac{12}{17}$
$\frac{8}{9} * 2 = \frac{8}{9} * \frac{2}{1} = \frac{16}{9} = 1\frac{7}{9}$
$\frac{4}{49} * 7 = \frac{4}{49} * \frac{7}{1} = \frac{4}{7}$
$7 * \frac{3}{40} = \frac{7}{1} * \frac{3}{40} = \frac{21}{40}$
$6 * \frac{15}{18} = \frac{6}{1} * \frac{15}{18} = \frac{15}{3} = 5$
$\frac{7}{12} * 24 = \frac{7}{12} * \frac{24}{1} = 7 * 2 = 14$
$45 * \frac{8}{15} = \frac{45}{1} * \frac{8}{15} = 3 * 8 = 24$
Пожауйста, оцените решение