$a)1\frac{3}{4}=1\frac{3\cdot 25}{4\cdot 25}=1\frac{75}{100}=1,75$

$b)\frac{9}{8}=1\frac{1}{8}=1\frac{1\cdot 125}{8\cdot 125}=1\frac{125}{1000}=1,125$

$c)2\frac{3}{8}=2\frac{3\cdot 125}{8\cdot 125}=2\frac{375}{1000}=2,375$

$d)4\frac{1}{3}=4,333\dots =4,\left(3\right)$

$e)\frac{22}{3}=7\frac{1}{3}=7,\left(3\right)$

$f)\frac{14}{9}=1\frac{5}{9}=1,555\dots =1,\left(5\right)$