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yaslorrayne
@yaslorrayne
October 2020
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Calcule a soma de todos os termos da PA (21,17,13...,-79).
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Sandraboni
R=-4
-79=21+(n-1).(-4)
-79=21-4n+4
-104=-4n
n=26
S=[(21-79).26]/2
S= -754
5 votes
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yaslorrayne
Muuuuuuuuuuuito obrigadoo
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Lista de comentários
-79=21+(n-1).(-4)
-79=21-4n+4
-104=-4n
n=26
S=[(21-79).26]/2
S= -754