Question

a soma dos 10 primeiros termos da PG 5,15,45​

Answer 1

$> \: resolucao \\ \\ \geqslant \: progressao \: \: geometrica \\ \\ q = \frac{a2}{a1} = \frac{15}{5} = 3 \\ \\ = = = = = = = = = = = \\ \\ sn = \frac{a1(q {}^{n} - 1) }{q - 1} \\ \\ sn = \frac{5(3 {}^{10} - 1) }{3 - 1} \\ \\ sn = \frac{5(59049 - 1)}{2} \\ \\ sn = \frac{5 \times 59048}{2} \\ \\ sn = \frac{295240}{2} \\ \\ sn = 147620 \\ \\ \\ \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant$