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thomashasley
@thomashasley
March 2022
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Calcule a soma dos 15 primeiros termos da P.A. (-3,4,11,...).
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Giselehem
A1=-An=?n=15 r=7
An=-3+(15-1)*7
14*7=98
-3+98=
An=95
Sn=(a1+an)*n divide por 2
sn= -3+95*15 divede por 2
Sn=690
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An=-3+(15-1)*7
14*7=98
-3+98=
An=95
Sn=(a1+an)*n divide por 2
sn= -3+95*15 divede por 2
Sn=690