3.(243)4/5 : (27)2/3=

[tex](243 \times \frac{4}{5} ) \div (27 \times \frac{2}{3} ) \\ ( \frac{972}{5} ) \div ( \frac{18}{1} ) \\ \frac{972}{5} \times \frac{1}{18} \\ \frac{972}{90} = 10 \frac{72}{90} = 10 \frac{4}{5} [/tex]

[tex] \frac{3.243. \frac{4}{5} }{27. \frac{2}{3} } = \frac{3.9.12 }{10} = \frac{162}{5} = 32,4[/tex]