a SOMA dos 7 termos da P.G (-3,6,-12..)
Lia192000:
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Dada a P.G (Progressão geométrica):

Iremos calcular inicialmente o valor da razão da P.G:

Agora substituindo na formula da soma de uma P.G finita:

Iremos calcular inicialmente o valor da razão da P.G:
Agora substituindo na formula da soma de uma P.G finita:
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