\[\frac{48x^{4}y^{3}}{49z^{9}}\ :\left( 16x^{7}y^{8} \right) =\]
\[= \frac{48x^{4}y³}{49z^{9} \cdot 16x^{7}y^{8}} = \frac{3}{49z^{9}x^{3}y^{5}}\]