$a)\frac{5}{6}>\frac{5}{9}$

$b)3\frac{1}{3}=3\frac{4}{12}$

$3\frac{1}{3}<3\frac{5}{12}$

$c)\frac{5}{6}=\frac{30}{36}$

$\frac{5}{6}>\frac{20}{36}$

$d)\frac{9}{4}=2\frac{1}{4}=2,25$

$\frac{9}{4}<2,5$

$e)\frac{2}{3}=\frac{20}{30}$

$0,6=\frac{6}{10}=\frac{18}{30}$

$\frac{2}{3}>0,6$

$f)5,1=5\frac{1}{10}$

$5,1<5\frac{1}{9}$

$g)-3,1<-2,9$

$h)-\frac{1}{5}>-\frac{1}{4}$

$i)-\frac{3}{5}=-\frac{6}{10}=-0,6$

$-\frac{3}{5}>-0,8$