Question

Determinar a soma dos 30 primeiros termos da PA(2,5,. ). .

Answer 1

Resposta:

1365

Explicação passo a passo:

r = 5 - 2 = 3

$a_3_0=a1+29r\\\\a_3_0=2+29.3\\\\a_3_0=2+87\\\\a_3_0=89\\\\S_3_0=\frac{(2+89).30}{2} \\\\S_3_0=91.15\\\\S_3_0=1365$