Respuesta :
[tex](-\dfrac{1}{3})\cdot(\dfrac{3}{5})\cdot(-\dfrac{5}{7})=-\dfrac{1}{5}\cdot(-\dfrac{5}{7})=\boxed{\frac{1}{7}}[/tex]
[tex](-\dfrac{1}{3})\cdot(\dfrac{3}{5})\cdot(-\dfrac{5}{7})=-\dfrac{1}{5}\cdot(-\dfrac{5}{7})=\boxed{\frac{1}{7}}[/tex]