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Karinebarbosa11
@Karinebarbosa11
December 2019
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Numa P.A em que o décimo termo é 100 e a razão 5, qual a soma dos 10 primeiros termos?
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marcia2017
(a₁ +an).n
Sn=--------------= an=a₁+(n-1).r
2 a₁₀=a₁+9.5
100=a₁+45
(55 +100).10 100-45=a₁=55
S₁₀=-------------------------
2
S₁₀=(155.10)/2= 1550/2=775
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(a₁ +an).n
Sn=--------------= an=a₁+(n-1).r
2 a₁₀=a₁+9.5
100=a₁+45
(55 +100).10 100-45=a₁=55
S₁₀=-------------------------
2
S₁₀=(155.10)/2= 1550/2=775