Упростите выражение:
а) $\frac{1}{2}abca + \frac{3}{4}b(-a)ca - \frac{1}{12}acba + \frac{5}{24}(-b)aca$;
б) $3nmk * 4n - \frac{3}{8}nm * (2\frac{2}{3}) * nk + \frac{2}{9}n^2m * (-4\frac{1}{2})k$.
$\frac{1}{2}abca + \frac{3}{4}b(-a)ca - \frac{1}{12}acba + \frac{5}{24}(-b)aca = \frac{12}{24}a^2bc - \frac{18}{24}a^2bc - \frac{2}{24}a^2bc - \frac{5}{24}a^2bc = -\frac{13}{24}a^2bc$
$3nmk * 4n - \frac{3}{8}nm * (2\frac{2}{3}) * nk + \frac{2}{9}n^2m * (-4\frac{1}{2})k = 12n^2mk - (\frac{3}{8} * \frac{8}{3})n^2mk - (\frac{2}{9} * \frac{9}{2})n^2mk = 12n^2mk - n^2mk - n^2mk = 10n^2mk$
Пожауйста, оцените решение
