ini pakai cara yaaa:)

12.a tiga
maaf cuma satu

[tex]12). {8}^{3} = {2}^{x} \\ ( {2}^{3} ) {}^{3} = {2}^{x} \\ {2}^{9} = {2}^{x } \\ x = 9[/tex]
[tex]13). \frac{1}{( \frac{1}{3}) {}^{2} } \\ = \frac{1}{ \frac{1}{9} } \\ = 9[/tex]
semoga membantu.....