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Geh1514
@Geh1514
September 2019
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A soma dos 20 termos de uma PA finita e igual a 710. Se o 1 termo dessas Pa é 7, calcule o 10 termo dessas Pa.
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minique2
S20 = 710
(a1+a20)*20/2 = 710
(7+a20)*10 = 710
(7+a20)= 71
a20 = 64
an = a1+ (n-1)r
a20 = a1+ 19r
64 = 7 + 19r
19r = 57
r=3
a10 = a1+9r
a10 = 7+9*3
a10 = 34
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Lista de comentários
(a1+a20)*20/2 = 710
(7+a20)*10 = 710
(7+a20)= 71
a20 = 64
an = a1+ (n-1)r
a20 = a1+ 19r
64 = 7 + 19r
19r = 57
r=3
a10 = a1+9r
a10 = 7+9*3
a10 = 34