$\frac{y^8}{y^2}=y^6$, тогда:
$\frac{x}{y^2}=\frac{y^6\ast <!--\; \ast \; -->x}{y^6\ast <!--\; \ast \; -->y^2}=\frac{x{y}^6}{y^8}$

$\frac{6b^3}{3b}=2b^2$, тогда:
$\frac{a}{3b}=\frac{2b^2\ast <!--\; \ast \; -->a}{2b^2\ast <!--\; \ast \; -->3b}=\frac{2a{b}^2}{6b^3}$

$\frac{12m^3{n}^2}{4m^{2}n}=3mn$, тогда:
$\frac{9}{4m^{2}n}=\frac{3mn\ast <!--\; \ast \; -->9}{3mn\ast <!--\; \ast \; -->4m^{2}n}=\frac{27mn}{12m^3{n}^2}$

$\frac{30b{d}^7}{15d^6}=2bd$, тогда:
$\frac{11c}{15d^6}=\frac{2bd\ast <!--\; \ast \; -->11c}{2bd\ast <!--\; \ast \; -->15d^6}=\frac{22bcd}{30b{d}^7}$