Question

4) Calcule a expressão numérica. Mostrar o passo a passo:
$( - 3) ^{2} + {4}^{ - 2} - ( {5}^{ - 2})$

$a) \frac{16}{25}$
$b)25$
$c) \frac{50}{32}$
$d)15$



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Answer 1

(-3)² + 4-² - 5-²

$9 + \frac{1}{ {4}^{2} } - \frac{1}{ {5}^{2} }$

$9 + \frac{1}{16} - \frac{1}{25}$

mmc(16,25) = 400

$\frac{3600 + 25 - 16}{400}$

$\frac{3609}{400} = 9 \frac{9}{400} = 9.0225$

Nenhuma das alternativas.

Se quiser assiste: https://youtu.be/-sZxQPgc1wA