( \frac{x}{y^2} = \frac{x}{y^2} \cdot \frac{y^6}{y^6} = \frac{xy^6}{y^8} )
( \frac{a}{3v} = \frac{a}{3v} \cdot \frac{2v^2}{2v^2} = \frac{2av^2}{6v^3} )
( \frac{9}{4m^2n} = \frac{9}{4m^2n} \cdot \frac{3m}{3m} \cdot \frac{3n}{3n} = \frac{27mn}{12m^3n^2} )
( \frac{11s}{15d^6} = \frac{11s}{15d^6} \cdot \frac{2d}{2d} \cdot \frac{15v}{15v} = \frac{330sdv}{30d^7v} )
( \frac{x}{y^2} = \frac{x}{y^2} \cdot \frac{y^6}{y^6} = \frac{xy^6}{y^8} )
( \frac{a}{3v} = \frac{a}{3v} \cdot \frac{2v^2}{2v^2} = \frac{2av^2}{6v^3} )
( \frac{9}{4m^2n} = \frac{9}{4m^2n} \cdot \frac{3m}{3m} \cdot \frac{3n}{3n} = \frac{27mn}{12m^3n^2} )
( \frac{11s}{15d^6} = \frac{11s}{15d^6} \cdot \frac{2d}{2d} \cdot \frac{15v}{15v} = \frac{330sdv}{30d^7v} )