iphone关闭通知:Help!!!!!!!!

来源：百度文库 编辑：高考问答 时间：2024/05/15 19:52:16
a1,a2,a3...,aN 是N个正数，且
a1*a2*a3*...*aN=1
试证
(2+a1)(2+a2)(2+a3)...(2+aN)≥3^N
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