Răspuns:
275
Explicație pas cu pas:
f: R → R, f(x) = x + 3
f(2) = 2+3=5 =>f(2)=5
f(2²)=f(4)=4+3=7 =>f(2²)=7
f(2³)=f(8)=8+3=11 =>f(2³)=11
f(2⁴)=f(16)=16+3=19 =>f(2⁴)=19
f(2⁵)=f(32)=32+3=35 =>f(2⁵)=35
f(2⁶)=f(64)=64+3=67 =>f(2⁶)=67
f(2⁷)=f(128)=128+3=131 =>f(2⁷)=131
f(2) + f (2²) + f (2³) + ... + f(2⁷)=5+7+11+19+35+67+131=275
