Hej!
[tex]a] \ -1,5^2=-(1,5\cdot1,5)=-2,25\\\\b] \ -\frac{1}{2^3}=-\frac{1}{2\cdot2\cdot2}=-\frac{1}{8}\\\\c] \ -(1\frac{1}{4})^2=-(\frac{5}{4})^2=-\frac{5^2}{4^2}=-\frac{5\cdot5}{4\cdot4}=-\frac{25}{16}=-1\frac{9}{16}\\\\d] \ -\frac{2^2}{5}=-\frac{2\cdot2}{5}=-\frac{4}{5}\\\\e] \ -1^2=-(1\cdot1)=-1[/tex]
