Question

$2 {}^{ - 2} - \frac{3}{8} =$
me ajudem!!!!​

Answer 1

Resposta:

$-\frac{1}{8}$

Explicação passo-a-passo:

$2^{-2}-\frac{3}{8}\\\\\mathrm{Aplicar\:as\:propriedades\:dos\:expoentes}:\quad \:a^{-b}=\frac{1}{a^b}\\\\\frac{1}{4}-\frac{3}{8}\\\\\frac{2}{8}-\frac{3}{8}\\\\\frac{2-3}{8}\\\\=-\frac{1}{8}$