Sagot :
[tex] To\ divide\ fraction\ multiply\ first\ fraction\ by\ inverse\ of\ the\ second:\\\\ \frac{m}{9}:\frac{mn^2}{3}=\frac{m}{9}*\frac{3}{mn^2}=\frac{1}{3n^2}
\\\\Solution\ is \ \frac{1}{3n^2}.[/tex]
[tex]\frac{m}{9}:\frac{mn^2}{3} =\frac{m}{9} \cdot \frac{3}{mn^2} =\frac{1}{3n^2}[/tex]