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Gleissonfidelis
@Gleissonfidelis
November 2019
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Determine a soma dos quinze primeiros termos da p.a.(-45,-41,-37,...).
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Determine a soma dos quinze primeiros termos da p.a.(-45,-41,-37,...).
R = A2 - A1
R = (-41) - (45)
R = 4
============================
An = A1 + (N - 1)*R
An = (-45) + (15 - 1)*4
An = (-45) + 14*4
An = (-45) + 56
An = 11
Então
Sn = (A1 + An)n/2
S15 = ((-45) + 11)15/2
S15 = (-34)*7,5
S15 = -255
Resposta : S15 = -255
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Verified answer
Determine a soma dos quinze primeiros termos da p.a.(-45,-41,-37,...).R = A2 - A1
R = (-41) - (45)
R = 4
============================
An = A1 + (N - 1)*R
An = (-45) + (15 - 1)*4
An = (-45) + 14*4
An = (-45) + 56
An = 11
Então
Sn = (A1 + An)n/2
S15 = ((-45) + 11)15/2
S15 = (-34)*7,5
S15 = -255
Resposta : S15 = -255