Упростите выражение:
1) $\frac{7}{27}m * \frac{9}{28}n$;
2) $5\frac{3}{5}k * 1\frac{4}{21}p$;
3) $20x * \frac{11}{35}y$;
4) $3\frac{4}{15}x * 1\frac{17}{28}y * \frac{4}{7}z$.
$\frac{7}{27}m * \frac{9}{28}n = \frac{1}{3}m * \frac{1}{4}n = \frac{1}{12}mn$
$5\frac{3}{5}k * 1\frac{4}{21}p = \frac{28}{5}k * \frac{25}{21}p = \frac{4}{1}k * \frac{5}{3}p = \frac{20}{3}kp = 6\frac{2}{3}kp$
$20x * \frac{11}{35}y = 4x * \frac{11}{7}y = \frac{44}{7}xy = 6\frac{2}{7}xy$
$3\frac{4}{15}x * 1\frac{17}{28}y * \frac{4}{7}z = \frac{1}{1}x * \frac{3}{1}y * \frac{1}{1}z = 3xyz$
Пожаулйста, оцените решение
