Question

дробь m-8 5m : дробь m^2-64 15 m^2

Answer 1

Если я верно понял условие:
$\frac{m - 8}{5m} : \frac{m^2-64}{15m^2} = \frac{m - 8}{5m} * \frac{15m^2}{m^2-8^2} = \frac{m-8}{5m} * \frac{3m*5m}{(m-8)(m+8)} = \\ \\ = \frac{3m * 5m(m-8)}{(m+8) * 5m(m - 8)} = \frac{3m}{m+8}$