[tex]\frac{3}{4} :\frac{1}{3} -\frac{9}{4} :(\frac{144}{100} :\frac{4}{100} )=\frac{3}{4} *\frac{3}{1} -\frac{9}{4} :(\frac{144}{100} *\frac{100}{4} )=\frac{9}{4} -\frac{9}{4} *\frac{36}{1} =\frac{9}{4} -\frac{324}{4} =\frac{-315}{4}[/tex]
