Resposta:
(-1,3)² = (-1,3) × (-1,3) = 1,69
[tex]( -\frac{1}{3} )^{3} = ( - \frac{1}{3}) \times ( - \frac{1}{3} ) \times ( - \frac{1}{3} ) = - \frac{1}{27} [/tex]
