若a,2a+2,3a+3,成等比数列,求实数a得值.
人气：307 ℃ 时间：2020-04-03 03:08:22
解答
（2a+2）平方=a(3a+3)
4a平方+8a+4=3a平方+3a
a平方+5a+4=0
(a+4)(a+1)=0
a1=-4 a2=-1
经检验 a=-4
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