Выполните умножение:
а) $\frac{9}{10} * \frac{5}{6}$;
б) $\frac{6}{25} * \frac{20}{21}$;
в) $\frac{17}{30} * \frac{26}{51}$;
г) $\frac{40}{7} * \frac{14}{5}$;
д) $\frac{57}{37} * \frac{74}{86}$;
е) $\frac{81}{115} * \frac{46}{81}$;
ж) $\frac{3}{16} * 4$;
з) $23 * \frac{5}{46}$;
и) $\frac{5}{13} * 39$;
к) $5 * 2\frac{1}{5}$;
л) $3\frac{3}{5} * 1\frac{1}{9}$;
м) $4\frac{2}{7} * 2$;
н) $2\frac{14}{15} * 6\frac{6}{11}$;
о) $2\frac{2}{25} * 1\frac{9}{16}$;
п) $\frac{13}{43} * 8\frac{7}{26}$.
$\frac{9}{10} * \frac{5}{6} = \frac{3}{2} * \frac{1}{2} = \frac{3}{4}$
$\frac{6}{25} * \frac{20}{21} = \frac{2}{5} * \frac{4}{7} = \frac{8}{35}$
$\frac{17}{30} * \frac{26}{51} = \frac{1}{15} * \frac{13}{3} = \frac{13}{45}$
$\frac{40}{7} * \frac{14}{5} = \frac{8}{1} * \frac{2}{1} = 16$
$\frac{57}{37} * \frac{74}{86} = \frac{57}{1} * \frac{2}{86} = \frac{57}{43} = 1\frac{14}{43}$
$\frac{81}{115} * \frac{46}{81} = \frac{1}{5} * \frac{2}{1} = \frac{2}{5}$
$\frac{3}{16} * 4 = \frac{3}{4}$
$23 * \frac{5}{46} = \frac{5}{2} = 2\frac{1}{2}$
$\frac{5}{13} * 39 = 5 * 3 = 15$
$5 * 2\frac{1}{5} = 5 * \frac{11}{5} = 11$
$3\frac{3}{5} * 1\frac{1}{9} = \frac{18}{5} * \frac{10}{9} = \frac{2}{1} * \frac{2}{1} = 4$
$4\frac{2}{7} * 2 = \frac{30}{7} * 2 = \frac{60}{7} = 8\frac{4}{7}$
$2\frac{14}{15} * 6\frac{6}{11} = \frac{44}{15} * \frac{72}{11} = \frac{4}{15} * \frac{72}{1} = \frac{4 * 72}{15} = \frac{288}{15} = \frac{96}{5} = 19\frac{1}{5}$
$2\frac{2}{25} * 1\frac{9}{16} = \frac{52}{25} * \frac{25}{16} = \frac{13}{1} * \frac{1}{4} = \frac{13}{4} = 3\frac{1}{4}$
$\frac{13}{43} * 8\frac{7}{26} = \frac{13}{43} * \frac{215}{26} = \frac{1}{1} * \frac{5}{2} = 2\frac{1}{2}$
Пожауйста, оцените решение