[tex]\\ (5^{12}:5^{10}-4^{18}:4^{16}):3^2
\\ Formula: \boxed{ \frac{x^a}{x^b}\:=\:x^{a-b}}
\\ 5^{12}:\:5^{10} = \frac{5^{12}}{5^{10}}= 5^{12-10}= 5^2 = 25
\\ 4^{18}:4^{16} = \frac{4^{18}}{4^{16}}=4^{18-16}= 4^2 = 16
\\ 3^2 = 9
\\ Acum \:\ vine: (25-16) : 9 =\ \textgreater \ (9):9 =\ \textgreater \ 9:9 = 1[/tex]
