[tex]1) \: \: \: \: \: \frac{ {17}^{9} \times {17}^{5} }{ {17}^{13} } = \frac{ {17}^{14} }{ {17}^{13} } = 17 \\ [/tex]

[tex]2) \: \: \: \: \: \frac{ {4}^{15} }{ {4}^{5} \times {4}^{8} } = \frac{4 {}^{15} }{ {4}^{13} } = {4}^{2} = 16 \\ [/tex]

[tex]3) \: \: \: \: \: \frac{ {5}^{16} \times {5}^{4} }{ {5}^{18} } = \frac{ {5}^{20} }{ {5}^{18} } = {5}^{2} = 25 \\ [/tex]

[tex]4) \: \: \: \: \: \frac{0.3 {}^{12} }{ {0.3}^{4} \times {0.3}^{5} } = \frac{ {0.3}^{12} }{ {0.3}^{9} } = {0.3}^{3} = 0.027 \\ [/tex]