已知等差数列｛An｝的公差为2,若A1 A3 A4 成等比数列,求A2?
写不下去了.急.
人气：377 ℃ 时间：2019-08-20 13:18:41
解答
A2=-6
(A2+2)/(A2-2)=(A2+4)/(A2+2)
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