[中學] 不等式
請各位數學猛男們指點小弟迷津 :(
設a1, a2, a3, a4, a5 皆為正實數
證明:
(1+a1)(1+a2)(1+a3)(1+a4)(1+a5)
>= [ 1 + (a1。a2。a3。a4。a5)^(1/5) ]^5
小弟用算幾不等式跟幾何平均數弄弄弄,卻怎麼也證不出來呀:(
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