1$\frac{3}{5}$ : $\frac{8}{27}$ . $\frac{5}{3}$
=$\frac{8}{5}$ . $\frac{27}{8}$ . $\frac{5}{3}$
=$\frac{8.27.5}{5.8.3}$
=9
2$\frac{1}{3}$ + 1$\frac{3}{5}$ . $\frac{5}{9}$
=$\frac{7}{3}$ + $\frac{8}{5}$ . $\frac{5}{9}$
=$\frac{7}{3}$ + $\frac{8.5}{5.9}$
=$\frac{7}{3}$ + $\frac{8.5}{5.9}$
=$\frac{7}{3}$ + $\frac{8}{9}$
=$\frac{21+8}{9}$
=$\frac{29}{9}$
Chúc bạn học tốt ^^
