Resposta:
Explicação passo-a-passo:
a)
[tex](\frac{3}{4} )^2 . (-2)^3 + (- \frac{1}{2} )=\\\\(\frac{9}{16} ) . (-8) + (- \frac{1}{2} )=\\\\-\frac{9}{2} - \frac{1}{2}=\\\\- \frac{10}{2} =\\\\=5[/tex]
b)
[tex](\frac{1}{2} )^{-2} +(\frac{1}{3} )^{-1} =\\\\= 4 + 3 = 7[/tex]
