Question

calcule a razao p.a onde: 20 termo vale 35 e o.primeiro vale -3

Answer 1

$> \: resolucao \\ \\ \geqslant \: progressao \: \: aritmetica \\ \\ a20 = 35 \\ a1 = - 3 \\ \\ = = = = = = = = = = = = = = = = \\ \\ > \: a \: razao \: \: da \: \: pa \\ \\ an = a1 + (n - 1)r \\ 35 = - 3 + (20 - 1)r \\ 35 = - 3 + 19r \\ 35 + 3 = 19r \\ 38 = 19r \\ r = \frac{38}{19} \\ r = 2 \\ \\ \\ \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \leqslant \geqslant \geqslant \geqslant \geqslant$