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JoaoVinicius99
@JoaoVinicius99
December 2019
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Dada a PA (1,3,5,7...)
Qual a soma dos 20 primeiros termos?
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Charda
1-3=2. r=2
An=a¹+(n-1)•r
an=1+(20-1)•2
an=1+19•2
an=1+38
an=39
sn=(a¹+an)•n/2
sn=(1+39)•20/2
sn=40•20/2
sn=800/2
sn=400
ta certinho!
4 votes
Thanks 6
jjzejunio
Formula: an = a1 + (n - 1).r
an = ?
a1 = 1
n = 20
r = 2
an = 1 + (20 - 1).2
an = 1 + 19.2
an = 1 + 38
an = 39
Sn = (a1 + an).n/2
Sn = (1 + 39).20/2
Sn = 40.20/2
Sn = 800/2
Sn = 400
A soma dos 20 primeiros termos é 400.
1 votes
Thanks 5
Charda
obgd por confirmar minha resposta :)
JoaoVinicius99
MT obg
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An=a¹+(n-1)•r
an=1+(20-1)•2
an=1+19•2
an=1+38
an=39
sn=(a¹+an)•n/2
sn=(1+39)•20/2
sn=40•20/2
sn=800/2
sn=400
ta certinho!
an = ?
a1 = 1
n = 20
r = 2
an = 1 + (20 - 1).2
an = 1 + 19.2
an = 1 + 38
an = 39
Sn = (a1 + an).n/2
Sn = (1 + 39).20/2
Sn = 40.20/2
Sn = 800/2
Sn = 400
A soma dos 20 primeiros termos é 400.