Упростите выражение:
1) $\frac{5}{8}a * \frac{4}{15}b$;
2) $6\frac{3}{4}x * 1\frac{11}{45}y$;
3) $\frac{13}{24}d * 32c$;
4) $18\frac{1}{3}a * 1\frac{2}{11}b * \frac{9}{13}c$.
$\frac{5}{8}a * \frac{4}{15}b = \frac{1}{2}a * \frac{1}{3}b = \frac{1}{6}ab$
$6\frac{3}{4}x * 1\frac{11}{45}y = \frac{27}{4}x * \frac{56}{45}y = \frac{3}{1}x * \frac{14}{5}y = \frac{42}{5}xy = 8\frac{2}{5}xy$
$\frac{13}{24}d * 32c = \frac{13}{3}d * 4c = \frac{52}{3}dc = 17\frac{1}{3}dc$
$18\frac{1}{3}a * 1\frac{2}{11}b * \frac{9}{13}c = \frac{55}{3}a * \frac{13}{11}b * \frac{9}{13}c = \frac{5}{1}a * \frac{1}{1}b * \frac{3}{1}c = 15abc$
Пожауйста, оцените решение
