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Carolinasilva18
@Carolinasilva18
December 2019
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Calcule a soma dos 8 primeiro termo da PG (-2,6,-18,...)
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marcia2017
Sn= a₁.(qⁿ -1) -2.(-3⁸ -1) - 2( 6561 -1) -18/6=-3
__________= ________ = __________ =
q-1 -3-1 -4
-2.6560 -13.120
= _____________ = _______= 3.280
-4 -4
1 votes
Thanks 0
mgs45
An = a1 . qⁿ⁻¹
a1 . (qⁿ - 1 ) -2 [(-3)⁸ - 1] -2 [6561 - 1]
Sn = ------------------∴ Sn = ------------------ ∴ Sn = --------------------
q-1 -3-1 -4
-2 [6560] - 13 120
Sn = ----------------- ∴∴ Sn = -------------- ∴ Sn = 3 280
-4 -4
1 votes
Thanks 0
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Lista de comentários
Sn= a₁.(qⁿ -1) -2.(-3⁸ -1) - 2( 6561 -1) -18/6=-3
__________= ________ = __________ =
q-1 -3-1 -4
-2.6560 -13.120
= _____________ = _______= 3.280
-4 -4
a1 . (qⁿ - 1 ) -2 [(-3)⁸ - 1] -2 [6561 - 1]
Sn = ------------------∴ Sn = ------------------ ∴ Sn = --------------------
q-1 -3-1 -4
-2 [6560] - 13 120
Sn = ----------------- ∴∴ Sn = -------------- ∴ Sn = 3 280
-4 -4