$1.$
$0,25 =$ $\frac{25}{100}$ $=$ $\frac{1}{4}$
$18,25 =$ $\frac{1825}{1000}$ $=$ $\frac{73}{4}$
$5,4 =$ $\frac{54}{10}$ $=$ $\frac{27}{5}$
$9,042 =$ $\frac{9042}{1000}$ $=$ $\frac{4521}{500}$
$2.$
$\frac{5}{4}$ $= 1,25$
$\frac{6}{15}$ $= 0,4$
$\frac{1}{8}$ $=0,125$
$\frac{25}{40}$ $= 0,625$
$\frac{120}{100}$ $= 1,2$