$a)0,75=\frac{75}{100}=\frac{15}{20}=\frac{3}{4}$

$b)0,8=\frac{8}{10}=\frac{4}{5}$

$c)0,06=\frac{6}{100}=\frac{3}{50}$

$d)0,44=\frac{44}{100}=\frac{22}{50}=\frac{11}{25}$

$e)0,025=\frac{25}{1000}=\frac{5}{200}=\frac{1}{40}$

$f)0,675=\frac{675}{1000}=\frac{135}{200}=\frac{27}{40}$