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thamiresgatinha
@thamiresgatinha
October 2020
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calcule a soma dos 10 primeiros termos da P.A. (-15,-8,-1,...)
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lucasfm2010
An= A1+(n-1).r
An= -15+(10-1). 7
An= -15+63
An= 48
Sn= n(a1+an)/2
Sn= 10(-15+48)/2
Sn=10(33)/2= 330/2
Sn=165
Sn= Soma dos termos
An= Ultimo Termo
a1= Primeiro Termo
r= Razão
4 votes
Thanks 6
thamiresgatinha
obrigada ; )
lucasfm2010
Merecee queridaa ;)
thamiresgatinha
haha♥
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Me ajudem a fazer por favor!!!
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Na p.a (8,a2, a3,17, 20,23, a7,29) calcule: a3
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Lista de comentários
An= -15+(10-1). 7
An= -15+63
An= 48
Sn= n(a1+an)/2
Sn= 10(-15+48)/2
Sn=10(33)/2= 330/2
Sn=165
Sn= Soma dos termos
An= Ultimo Termo
a1= Primeiro Termo
r= Razão