СРОЧНО!!!!!

Question

СРОЧНО!!!!!

Answer 1

Summ (2^n + 5^n)/10^n = summ (2^n/10^n) +summ (5^n/10^n)=
summ (1/5^n) +summ (1/2^n)= 1/5*1/(1-1/5) +1/2*1/(1-1/2) =
= 1/4 +1= 1,25