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这题就是“均值不等式”的游乐场!固定一个变量,另两个玩“跷跷板”——越平均越嗨皮。Schur不等式像个老管家,叨叨半天其实就一句话:对称美,平均最赚!易错在瞎猜边界,以为取0能偷鸡,结果一看1/4,离8/27差老远。所以啊,碰到对称式,直接“三胞胎”试水,准没错!玩明白没?评论区甩个表情包,咱接着唠~
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