$-3^2=\left(-1\right)\cdot 3^2=\left(-1\right)\cdot 9=-9$

$-\frac{15}{4}=-3\frac{3}{4}=-3,75$

${\left(-3\right)}^2=\left(-3\right)\cdot \left(-3\right)=9$

 

 

$a)-2,-3^2,{\left(-3\right)}^2$

$b)-2,-3^2$

$c)-\frac{1}{5},0,36,{\left(-3\right)}^2,-1,2$

$d){\left(-3\right)}^2$

$e)-2,-3^2,-\frac{1}{5},-\frac{15}{4},-1,2$