版选修4_5.pptx

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3.3 排序不等式,本节目标,1.了解排序不等式并理解乱序和、反序和、顺序和的概念 2掌握排序不等式的推导和证明过程 3会利用排序不等式解决简单的不等式问题.,预习反馈,预习反馈,预习反馈,预习反馈,预习反馈,预习反馈,反序和乱序和顺序和,反序和,顺序和,乱序和,a1b1a2b2anbn,b1b2bn,1顺序和,反序和,乱序和的大小关系是_答案 反序和乱序和顺序和2已知两组数1,2,3和4,5,6,若c1,c2,c3是4,5,6的一个排列,则1c12c23c3的最大值是_,最小值是_解析 由反序和乱序和顺序和知,顺序和最大,反序和最小,故最大值为32;最小值为28.答案 32 28,随堂检测,3有4人各拿一只水桶去接水,设水龙头注满每个人的水桶分别需要5 s,4 s,3 s,7 s,每个人接完水后就离开,则他们等候的总时间最短为_s.解析 由题意知,等候的时间最短为344352741.答案 41,随堂检测,随堂检测,随堂检测,本课小结,

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