$a\text{)}{\left(0,012\right)}^2=0,012\cdot 0,012=0,000144$    

$b\text{)}{\left(1,75\right)}^3=1,75\cdot 1,75\cdot 1,75=5,359375$  

$c\text{)}{\left(3\frac{1}{2}\right)}^3=3,5\cdot 3,5\cdot 3,5=42,875$  

$d\text{)}{\left(-0,31\right)}^2=0,31\cdot 0,31=0,0961$