Calcule os cinco primeiros termos de cada PA : a) a¹ = 12 e r = 7 

b) a¹ = 12 e r = - 7

c) a¹ = -2 e r = 1
                      2

d) a¹ = 12 e r = 0,25 

Quem souber coloque a letra de qual ira responder ! OBG
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