Вычислите:
а) $-5 * \frac{3}{7}$;
б) $5 * (-\frac{3}{7})$;
в) $\frac{4}{15} * (-3)$;
г) $(-12) * (-\frac{2}{25})$;
д) $-7 * (-\frac{4}{21})$;
е) $-\frac{3}{17} * 6$;
ж) $-\frac{2}{21} * (-4)$;
з) $(-8) * (-\frac{7}{16})$;
и) $\frac{3}{4} * (-12)$.
$-5 * \frac{3}{7} = (-1) * \frac{5 * 3}{7} = -\frac{15}{7} = -2\frac{1}{7}$
$5 * (-\frac{3}{7}) = (-1) * \frac{5 * 3}{7} = -\frac{15}{7} = -2\frac{1}{7}$
$\frac{4}{15} * (-3) = (-1) * \frac{4 * 3}{15} = -\frac{12}{15} = -\frac{4}{5}$
$(-12) * (-\frac{2}{25}) = (-1) * (-\frac{12 * 2}{25}) = -(-\frac{24}{25}) = \frac{24}{25}$
$-7 * (-\frac{4}{21}) = (-1) * (-\frac{7 * 4}{21}) = -(-\frac{28}{21}) = \frac{4}{3} = 1\frac{1}{3}$
$-\frac{3}{17} * 6 = (-1) * \frac{3 * 6}{17} = -\frac{18}{17} = -1\frac{1}{17}$
$-\frac{2}{21} * (-4) = (-1) * (-\frac{2 * 4}{21}) = -(-\frac{8}{21}) = \frac{8}{21}$
$(-8) * (-\frac{7}{16}) = (-1) * (-\frac{8 * 7}{16}) = -(-\frac{7}{2}) = 3\frac{1}{2}$
$\frac{3}{4} * (-12) = (-1) * \frac{3 * 12}{4} = -9$
Пожауйста, оцените решение