Question

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Answer 1

Resposta:

a) 5/6

b) 1/125

c) - 1/9

Explicação passo-a-passo:

$a)3^{-1} +2^{-2} -(-4)^{-1} =\frac{1}{3} +\frac{1}{2^{2} } -(-\frac{1}{4} )=\frac{1}{3} +\frac{1}{4} +\frac{1}{4} = \frac{1}{3} +\frac{2}{4} =\frac{1}{3}+\frac{1}{2} =\frac{2+3}{6}= \frac{5}{6}$

$b)5^{-3} =\frac{1}{5^{3} } =\frac{1}{125}$

$c)(-3)^{-2} =-\frac{1}{3^{2} } =-\frac{1}{9}$