Question

me ajude por favor e urgente ​

Answer 1

Resposta:

$1.\\ \\ a)\\ \\ 5^{5} :5^{3} =5^{5-3} =5^{2} =25\\ \\ b)\\ \\ -(\frac{2}{9} )^{3} =-\frac{2.2.2}{9.9.9} =\frac{8}{729} \\ \\ c)\\ \\ 3^{3} .3^{2} =3^{3+2} =3^{5} =243$

$2.\\ \\ a)\\ \\ 8^{\frac{1}{2} } =\sqrt[2]{8^{1} } =\sqrt{8} \\ \\ b)\\ \\ 10^{-3} =\frac{1}{10^{3} } =\frac{1}{1000} =0,001\\ \\ c)\\ \\ (\frac{4}{8} )^{-2} =\frac{1}{(\frac{4}{8} )^{2} } =\frac{1}{(\frac{16}{64}) } =1.\frac{64}{16} =\frac{64}{16} =4$