Question

Вычислите:
5^(n+1)*2^(n+2)
------------------------
20 *10^n

Answer 1

$dfrac{5^{n+1}cdot 2^{n+2}}{20cdot 10^n}=dfrac{5cdot 5^{n}cdot 2^2cdot 2^{n}}{20cdot 5^ncdot 2^n}= dfrac{20}{20} =1$