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Baroni0666
@Baroni0666
December 2019
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Calcule o vigésimo termo da P.A,sabendo que a3 + a6 = 4 e a2 + a8 =8
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exalunosp
A1 + 2r + a1 + 5r = 4
a1 + r + a1 + 7r = 8
-------------------------------
2a1 + 7r = 4 ( vezes - 1 )
2a1 + 8r = 8
---------------------------
-2a1 - 7r = -4
2a1 + 8r = 8
-----------------------------
// r = 4 ****
2a1 + 7 ( 4 ) = 4
2a1 + 28 = 4
2a1 = 4 - 28
2a1 = - 24
a1 = -24/2 = -12 ***
a1 + 19r = -12 + 19 ( 4) = -12 + 76 = 64****
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a1 + r + a1 + 7r = 8
-------------------------------
2a1 + 7r = 4 ( vezes - 1 )
2a1 + 8r = 8
---------------------------
-2a1 - 7r = -4
2a1 + 8r = 8
-----------------------------
// r = 4 ****
2a1 + 7 ( 4 ) = 4
2a1 + 28 = 4
2a1 = 4 - 28
2a1 = - 24
a1 = -24/2 = -12 ***
a1 + 19r = -12 + 19 ( 4) = -12 + 76 = 64****