Question

$frac{5^-10}{5^-3*5^-5}$

Answer 1

$= frac{ frac{1}{ 5^{10} } }{ frac{1}{ 5^{3} } * frac{1}{ 5^{5} } } = frac{1}{ 5^{10} }* frac{ 5^{8} }{1}= frac{1}{ 5^{2} }= frac{1}{25}$