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Denis15
@Denis15
April 2020
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Calcule a Soma dos Vinte Primeiros Termos da P.A (-13,-7,-1...)
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AntoniLAD
Verified answer
An=a1+(n-1).r
a20=-13+(20-1).6
a20=-13+19.6
a20=-13+114
a20=101
sn=(a1+a20).n/2
s20=(-13+1101).20/2
s20=88.20/2
s20=1760/2
s20=880
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Verified answer
An=a1+(n-1).ra20=-13+(20-1).6
a20=-13+19.6
a20=-13+114
a20=101
sn=(a1+a20).n/2
s20=(-13+1101).20/2
s20=88.20/2
s20=1760/2
s20=880