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BehDecesary1223
@BehDecesary1223
September 2019
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Calcule a soma dos 30 primeiros termos da pa (-15, -11, -7, -3, ...)
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moaramarquesp0396q
N=30
a1=-15
q=4
an=a1+(n-1)*r
a30=-15+(30-1)*4
a30=-15+29*4
a30=-15+116
a30=101
sn=(a1+an)*n/2
sn=(-30+101)*30/2
sn=71*30/2
sn=2130/2
sn=1065
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a1=-15
q=4
an=a1+(n-1)*r
a30=-15+(30-1)*4
a30=-15+29*4
a30=-15+116
a30=101
sn=(a1+an)*n/2
sn=(-30+101)*30/2
sn=71*30/2
sn=2130/2
sn=1065