Question

Am nevoie urgent de rezolvare

Answer 1

Explicație pas cu pas:

10.

$3 \cdot (1 + 4 + {4}^{2} + ... + {4}^{8}) = 3 \cdot \dfrac{ 1 \cdot ({4}^{9} - 1)}{4 - 1} =$

$= 3 \cdot \dfrac{{4}^{9} - 1}{3} = {4}^{9} - 1 = {( {2}^{2} )}^{9} - 1$

$= {2}^{18} - 1 < {2}^{18}$

q.e.d.