Question

Alguém Me Ensina Por Favor?​

Answer 1

Resposta:

$a)\\ {(5^{-5+8})^4\over5^{-12}.5^4}={(5^3)^4\over5^{-12+4}}={5^{12}\over5^{-8}}={5^{12}\div5^{-8}={5^{12-(-8)}=5^{12+8}=5^{20}$

$b)\\ {(2^3)^3.(2^4)^{-2}\over(2^2)^4}={2^9.2^{-8}\over2^8}={2^{9-8}\over2^8}=2^1\div2^8=2^{1-8}=2^{-7}$

$c)\\ {\sqrt{40.63} \over\sqrt{70}} ={\sqrt{2520\div70} =\sqrt{36} =6$

c) pode assim também

${\sqrt{2^2.2.5} .\sqrt{3^3.7} \over\sqrt{14.5} }={2\sqrt{10} .3\sqrt{7} \over\sqrt{70} }={6\sqrt{70} \over\sqrt{70} }=6$