Odpowiedź:
[tex]a)\ \ \dfrac{8}{\frac{2}{5}}=8:\frac{2}{5}=\not8^4\cdot\frac{5}{\not2_{1}}=4\cdot5=20\\\\\\b)\ \ \dfrac{\frac{4}{9}}{\frac{5}{3}}=\frac{4}{9}:\frac{5}{3}=\frac{4}{\not9_{3}}\cdot\frac{\not3^1}{5}=\frac{4}{15}\\\\\\c)\ \ 5\cdot\dfrac{7}{\frac{5}{8}}=5\cdot(7:\frac{5}{8})=5\cdot(7\cdot\frac{8}{5})=\not5\cdot\frac{56}{\not5}=56[/tex]
