Question

alguém pode me ajudar a resolver esses cálculo por favor

Answer 1

6)

$(\frac{-9}{6})^{2} - (\frac{-12}{2})^{-2} \\\\ \frac{81}{36} - (\frac{2}{-12})^{2}\\ \\ \frac{81}{36} - \frac{4}{144} = \frac{324-4}{144} = \frac{320}{144} = 2\frac{2}{9}$

7)

a) $27^{-4}.81^{4}\\ \\ (\frac{1}{27})^{4}.81^{4} = (\frac{1}{27}.81)^{4} = (\frac{81}{27})^{4} = 3^{4} = 81$

b) $\frac{128^{3}32^{2}}{64^{5}} = \frac{(2^{7})^{3}(2^{5})^{2}}{(2^{6})^{5}} = \frac{2^{21}2^{10}}{2^{30}} = \frac{2^{31}}{2^{30}} = 2^{1} = 2$