Răspuns :
Răspuns:
Explicație pas cu pas:
f(3)=2 x 3+5=11 ; f(3^2)=2 x 9+5=23; f(3^3)=2 x 27+5=59 ; f(3^4)=2 x 81+5= 162+5=167; f(3^5)=2 x 243+5=486+5=491 ; 11+23+59+167+491=751
f(3) = 2 · 3 + 5 = 11.
f(3²) = 2 · 3² + 5 = 23.
f(3³) = 2 · 3³ + 5 = 59.
f(3⁴) = 2 · 3⁴ + 5 = 167.
f(3⁵) = 2 · 3⁵ + 5 = 491.
S = 11 + 23 + 59 + 167 + 491 = 751.
f(3²) = 2 · 3² + 5 = 23.
f(3³) = 2 · 3³ + 5 = 59.
f(3⁴) = 2 · 3⁴ + 5 = 167.
f(3⁵) = 2 · 3⁵ + 5 = 491.
S = 11 + 23 + 59 + 167 + 491 = 751.