Question

Me ajudem por favor!

Answer 1

Resposta:

a)$-5^{-3}=-5.-5.-5=-25.-5=-125$

b)$1\frac{2}{7}^{-1} = \frac{1.7+2}{7} =\frac{9}{7}^{1} =\frac{9}{7}$

c)$\sqrt[-3]{7} - simplifique a raiz=7^{-1}=\frac{1}{7}$

d)$2\sqrt{2} ^{-1} = \frac{1}{2\sqrt{2} } . \frac{\sqrt{2} }{\sqrt{2} } = \frac{1\sqrt{2} }{2\sqrt{2}\sqrt{2} } =\frac{\sqrt{2} }{2.2} = \frac{\sqrt{2} }{4}$

Explicação passo-a-passo: