Olá!
[tex](\frac{2}{3} )^{3}[/tex] = [tex]\frac{2^{3} }{3^{3}}[/tex] = [tex]\frac{8}{27}[/tex]
[tex](\frac{1}{2} )^{2}[/tex] = [tex]\frac{1^{2}}{2^{2}}[/tex] = [tex]\frac{1}{4}[/tex]
Abraços!
