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vickpekennah
@vickpekennah
March 2022
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calcule a soma dos primeiros 60 termos da PA (8,15,22...)
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daisycastro
Verified answer
R = 15 - 8 = 7
a1 = 8
n = 60
an = a1 + (n - 1) . r
a60 = 8 + (60 - 1 ) . 7
a60 = 8 + (59) . 7
a60 = 8 + 413
a60 = 421
Sn =
( a1 + an) . n
2
S60 =
( 8 + a60) . 60
2
S60 =
( 8 + 421) . 60
2
S60 =
(429) . 60
2
S60 =
25.740
2
S60 = 12.870
A Soma dos primeiros 60 termos da PA é 12.870.
1 votes
Thanks 1
vickpekennah
obrg :)
daisycastro
de nada, bons estudos!!!!
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Lista de comentários
Verified answer
R = 15 - 8 = 7a1 = 8
n = 60
an = a1 + (n - 1) . r
a60 = 8 + (60 - 1 ) . 7
a60 = 8 + (59) . 7
a60 = 8 + 413
a60 = 421
Sn = ( a1 + an) . n
2
S60 = ( 8 + a60) . 60
2
S60 = ( 8 + 421) . 60
2
S60 = (429) . 60
2
S60 = 25.740
2
S60 = 12.870
A Soma dos primeiros 60 termos da PA é 12.870.