Question

$12.[(\sqrt{2} )^{-2} -(\sqrt{3}) ^{-2} ]$

Answer 1

Resposta:

r→ 2

Explicação passo-a-passo:

$12.[(\sqrt{2} )^{-2}-(\sqrt{3} )^{-2}]=\\ \\ 12.(\sqrt{2^{-2}} -\sqrt{3^{-2}} )=\\ \\ 12.(\sqrt{1\over2^2}} -\sqrt{{1\over3^2}} )=\\ \\ 12.(\sqrt{{1\over4}} -\sqrt{{1\over9}} )=\\ \\ 12.({1\over2}-{1\over3})=\\ \\ 12.({3-2\over6})=\\ \\ 12.{1\over6}={12\over6}=2$