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gustavofabricio
@gustavofabricio
April 2022
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interpole 8 meios aritméticos entre 26 e -1
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Helvio
Verified answer
an = a1 + ( n -1) * r
-1 = 26 + ( 10 -1) * r
-1 = 26 + 9r
-27 = 9r
r = -3
Razão = -3
=============
n an = a1 + ( n -1) * r an
1 an = 26 + ( 1 -1) * -3 26
2 an = 26 + ( 2 -1) * -3 23
3 an = 26 + ( 3 -1) * -3 20
4 an = 26 + ( 4 -1) * -3 17
5 an = 26 + ( 5 -1) * -3 14
6 an = 26 + ( 6 -1) * -3 11
7 an = 26 + ( 7 -1) * -3 8
8 an = 26 + ( 8 -1) * -3 5
9 an = 26 + ( 9 -1) * -3 2
10 an = 26 + ( 10 -1) * -3 -1
PA = {26, 23, 20, 17, 14, 11, 8, 5, 2, -1}
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Helvio
De nada.
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gustavofabricio
April 2022 | 0 Respostas
Por favor me ajuda nessa questao? determine o primeiro termo e o numero de termos de umaP.A. em que an = -12,r = 2 e sn = -80?
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Lista de comentários
Verified answer
an = a1 + ( n -1) * r-1 = 26 + ( 10 -1) * r
-1 = 26 + 9r
-27 = 9r
r = -3
Razão = -3
=============
n an = a1 + ( n -1) * r an
1 an = 26 + ( 1 -1) * -3 26
2 an = 26 + ( 2 -1) * -3 23
3 an = 26 + ( 3 -1) * -3 20
4 an = 26 + ( 4 -1) * -3 17
5 an = 26 + ( 5 -1) * -3 14
6 an = 26 + ( 6 -1) * -3 11
7 an = 26 + ( 7 -1) * -3 8
8 an = 26 + ( 8 -1) * -3 5
9 an = 26 + ( 9 -1) * -3 2
10 an = 26 + ( 10 -1) * -3 -1
PA = {26, 23, 20, 17, 14, 11, 8, 5, 2, -1}