[tex](\frac{3}{4} )^{3} =\frac{27}{64}[/tex]
[tex](\frac{1}{9} )^2= \frac{1}{81}[/tex]
[tex]-(-\frac{1}{3} )^3=\frac{1}{27}[/tex]
[tex](-\frac{2}{5})^2=\frac{4}{25}[/tex]