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设x,y为正数,则(x+y)http://picflow.koolearn.com/upload/papers/g02/20110829/20110829090544703991.gif的最小值为

发布时间:2021-07-21

A.6

B.9

C.12

D.15

试卷相关题目

  • 1若x,y∈R+,且http://picflow.koolearn.com/upload/papers/g02/20110908/201109081602227341089.gif恒成立,则a的最小值是

    A.2http://picflow.koolearn.com/upload/papers/g02/20110908/20110908160222750882.gif

    B.http://picflow.koolearn.com/upload/papers/g02/20110908/20110908160222765882.gif

    C.2

    D.1

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  • 2若双曲线http://picflow.koolearn.com/upload/papers/g02/20111018/20111018160515109970.gif=1(a>0,b>0)的离心率是2,则http://picflow.koolearn.com/upload/papers/g02/20111018/20111018160515109941.gif的最小值为

    A.http://picflow.koolearn.com/upload/papers/g02/20111018/20111018160515140918.gif

    B.http://picflow.koolearn.com/upload/papers/g02/20111018/20111018160515171892.gif

    C.2

    D.1

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  • 3已知x>1,y>1,且http://picflow.koolearn.com/upload/papers/g02/20111031/20111031100252015854.giflnx,http://picflow.koolearn.com/upload/papers/g02/20111031/20111031100252015854.gif,lny成等比数列,则xy

    A.有最大值e

    B.有最大值http://picflow.koolearn.com/upload/papers/g02/20111031/20111031100252031866.gif

    C.有最小值e

    D.有最小值http://picflow.koolearn.com/upload/papers/g02/20111031/20111031100252046866.gif

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  • 4设a,b,c∈(-∞,0),则a+http://picflow.koolearn.com/upload/papers/g02/20111101/20111101110557781883.gif,b+http://picflow.koolearn.com/upload/papers/g02/20111101/20111101110557781874.gif,c+http://picflow.koolearn.com/upload/papers/g02/20111101/20111101110557796882.gif

    A.都不大于-2

    B.都不小于-2

    C.至少有一个不大于-2

    D.至少有一个不小于-2

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  • 5已知x>0,y>0,lg2x+lg8y=lg2,则http://picflow.koolearn.com/upload/papers/g02/20110928/20110928140920718955.gif的最小值是

    A.2http://picflow.koolearn.com/upload/papers/g02/20110928/20110928140920750876.gif

    B.4http://picflow.koolearn.com/upload/papers/g02/20110928/20110928140920750876.gif

    C.2+http://picflow.koolearn.com/upload/papers/g02/20110928/20110928140920781876.gif

    D.4+2http://picflow.koolearn.com/upload/papers/g02/20110928/20110928140920781876.gif

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  • 6某人要买房,随着楼层的升高,上下楼耗费的精力增多,因此不满意度升高。当住第n层楼时,上下楼造成的不满意度为n,但高处空气清新,嘈杂音较小,环境较为安静,因此随着楼层的升高,对环境的不满意程度降低。设住第n层楼时,对环境的不满意程度为http://picflow.koolearn.com/upload/papers/g02/20110815/20110815114542968887.gif, 则此人应选

    A.1楼

    B.2楼

    C.3楼

    D.4楼

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    A.最大值64

    B.最小值http://picflow.koolearn.com/upload/papers/g02/20110829/20110829101532546903.gif

    C.最小值http://picflow.koolearn.com/upload/papers/g02/20110829/20110829101532562879.gif

    D.最小值64

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    A.8

    B.4

    C.1

    D.http://picflow.koolearn.com/upload/papers/g02/20110905/20110905153439897869.gif

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    A.http://picflow.koolearn.com/upload/papers/g02/20110908/20110908103309906923.gif

    B.http://picflow.koolearn.com/upload/papers/g02/20110908/20110908103309921926.gif

    C.http://picflow.koolearn.com/upload/papers/g02/20110908/20110908103309968883.gif

    D.http://picflow.koolearn.com/upload/papers/g02/20110908/20110908103310015883.gif

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  • 10一篮球运动员投篮得分ξ的分布列如下表ξ320Pabc且abc≠0,已知他投篮一次得出的数学期望为1(不计其它得分情况),则ab的最大值为

    A.http://picflow.koolearn.com/upload/papers/g02/20111018/20111018113440001.gif

    B.http://picflow.koolearn.com/upload/papers/g02/20111018/20111018093354734889.gif

    C.http://picflow.koolearn.com/upload/papers/g02/20111018/20111018093354765880.gif

    D.http://picflow.koolearn.com/upload/papers/g02/20111018/20111018093354765866.gif

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