[tex]c)\ 5^{-195} : (0.2)^{180} : 125^{-6} = 5^{-195} : (\frac{2}{10} )^{180} : (5^{3})^{-6} = 5^{-195} : (\frac{1}{5} )^{180} : 5^{-18} = 5^{-195} : (5^{-1} )^{180} : 5^{-18} = 5^{-195} : 5^{-180} : 5^{-18} = 5^{195 + 180 + 18} = 5^{3} = 125[/tex]
[tex]d)\ \frac{2^{155} * 3^{155}}{6^{157}} = \frac{6^{155}}{6^{157}} = 6^{155 - 157}= 6^{-2} = \frac{1}{6^{2}} = \frac{1}{36}[/tex]
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[tex]c)\ 5^{-195} : (0.2)^{180} : 125^{-6} = 5^{-195} : (\frac{2}{10} )^{180} : (5^{3})^{-6} = 5^{-195} : (\frac{1}{5} )^{180} : 5^{-18} = 5^{-195} : (5^{-1} )^{180} : 5^{-18} = 5^{-195} : 5^{-180} : 5^{-18} = 5^{195 + 180 + 18} = 5^{3} = 125[/tex]
[tex]d)\ \frac{2^{155} * 3^{155}}{6^{157}} = \frac{6^{155}}{6^{157}} = 6^{155 - 157}= 6^{-2} = \frac{1}{6^{2}} = \frac{1}{36}[/tex]