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Gabyye22
@Gabyye22
November 2019
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Calcule a soma do 24 primeiro termo da PA: A (-1/2, -1/4, 0, ...)
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exalunosp
A1 = - 1/2
a2 = - 1/4
r = - 1/4 - ( - 1/2 ) = - 1/4 + 1/2 = ( -1 + 2 )/4 = 1/4 ***
n = 24
a24 = a1 + 23r ou - 1/2 + 23 ( 1/4 ) ou - 1/2 + 23/4 = ( -2 + 23)/4 = 21/4 ***
S24 = ( a1 + a24). 24/2
S24 = ( - 1/2 + 21/4). 12
S24 =[ ( -2 + 21)/4 ] * 12/1 = 19/4 * 12/1 = 228/4 =57 ***
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a2 = - 1/4
r = - 1/4 - ( - 1/2 ) = - 1/4 + 1/2 = ( -1 + 2 )/4 = 1/4 ***
n = 24
a24 = a1 + 23r ou - 1/2 + 23 ( 1/4 ) ou - 1/2 + 23/4 = ( -2 + 23)/4 = 21/4 ***
S24 = ( a1 + a24). 24/2
S24 = ( - 1/2 + 21/4). 12
S24 =[ ( -2 + 21)/4 ] * 12/1 = 19/4 * 12/1 = 228/4 =57 ***