Indique a sentença verdadeira,justificando com os calculos. a) 81^-1 = 9
b) 4^-3= -16
c) 5^-2 = 1/25
d) 7^-2 = -49
{^= elevaçao
b) 4^-3= -16
c) 5^-2 = 1/25
d) 7^-2 = -49
{^= elevaçao
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