Question

21 задание, помогите

Answer 1

$frac{3^{2n+2}*5^{n-2}}{45^{n+1}}= frac{3^{2n+2}*5^{n-2}}{(3^{2}*5)^{n+1}}= frac{3^{2n+2}*5^{n-2}}{3^{2n+2}*5^{n+1}}= 5^{n-2-n-1}= 5^{-3}= frac{1}{125}=0,008$