Em uma progressao geometrica , tem-se que a6 =4/9 e a7 = - 4/27. O primeiro termo dessa progressao é´. a) a1= -4 x 3( elevado a 5). b)a1= -4 x 3(elevado a 4) c)a1= -4 x 3(elevado a 3) d)a1= -4 x 3(elevado a 2)
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