Respostas

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2013-12-04T10:59:33-02:00
A) P.A. (4, 4+(1.3), 4+(2.3), 4+(3.3), 4+(4.3) )
PA (4,7,10,13,16)

B) a1=20 r=-4
P.A. (20, 20+(1.-4), 20+(2.-4), 20+(3.-4), 20+(4.-4) )
P.A.(20,16,12,8,4)
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