Question

preciso urgentemente pra hoje

Answer 1

$9.10^7.7.10^{-3}=3.10^5 \\ 9.7.10^{7}.10^{-3}=3.10^5 \\ 63.10^{7-3}=3.10^5 \\ 63.10^4=3.10^5 \\ \frac{63.10^4}{3.10^5} = \\ \\ 21.10^{4-5}= \\ 21.10^{-1}= \\ 21. \frac{1}{10^1} = \\ \frac{21}{10} = \\ 2,1$