Dear Henry.How are you doing? I' m writing to seek your help, because we are to start a Green CampusCampaign to arouse students awareness of environmental protectionWe plan to organize this campaign like this. First, a series of lectures will be given, introducingways to buld a low-carbon schont life This/will be followed by a discussion about ways of savingwater, paper, and electricity at school: But how can we put them into practice and make them ourdaily routine? I wonder if you could give me some practical advice as I know you ve organized suchactiviticsLooking forward to your reply.Yours sincerelyua

23.解:本题考查不等式证明(1)由a+b+c=3,知3=a++a千B+3+c22+2√22b+√2(当且仅当q一2一cb时取“=”),即{+当且仅当a~b=c时取”一”…………5分(2)由bte4a(当且仅当2a-b+c时取“=”),同理知c+4≥b当且仅当26=a+c时取“=”),++bc(当且仅当2c=a+b时取“=”),+b4故++b+cc+aa+b 1Cathro44当且仅当a=b=c时取“=”)10分注:①取等条件未说明不重复扣分;②还有其它方法,只要正确均可给满分

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