Calcule o valor das expressoes abaixo
a) (-2)^2+(-2)^3
b)(-3)^0-(-3)^3
c)3^-1+(3) ^-1
(2)
d)8^-1 x (2)^2
(3)

e)2^-1 + 2^0

f)(-2)^2-(-2)^-2
(-3) (-3)

g) 5^0=5^-1
5^-2

h)(0,25)^2-(0,5)^3
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