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http://picflow.koolearn.com/upload/papers/20140823/20140823122642194621.gif的展开式中,含 http://picflow.koolearn.com/upload/papers/20140823/20140823122642210199.gif项的系数是首项为 http://picflow.koolearn.com/upload/papers/20140823/20140823122642241194.gif,公差为3的等差数列的( )

发布时间:2021-07-12

A.第13项

B.第18项

C.第20项

D.第11项

试卷相关题目

  • 1http://picflow.koolearn.com/upload/papers/20140823/20140823143018416386.gif为整数,若 http://picflow.koolearn.com/upload/papers/20140823/20140823143018431192.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823143018447197.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823143018447204.gif除得的余数相同,则称 http://picflow.koolearn.com/upload/papers/20140823/20140823143018431192.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823143018447197.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823143018447204.gif同余,记为 http://picflow.koolearn.com/upload/papers/20140823/20140823143018509548.gif 已知 http://picflow.koolearn.com/upload/papers/20140823/20140823143018525767.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823143018541438.gif,则 http://picflow.koolearn.com/upload/papers/20140823/20140823143018447197.gif的值可以是

    A.2010

    B.2011

    C.2008

    D.2009

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  • 2http://picflow.koolearn.com/upload/papers/20140823/20140823134607394702.gif展开式中的常数项为

    A.1

    B.46

    C.4245

    D.4246

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  • 3二项式 http://picflow.koolearn.com/upload/papers/20140823/20140823134849400656.png展开式中含有 http://picflow.koolearn.com/upload/papers/20140823/20140823134849416342.png项,则 http://picflow.koolearn.com/upload/papers/20140823/20140823134849431304.png可能的取值是

    A.5

    B.6

    C.7

    D.8

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  • 4http://picflow.koolearn.com/upload/papers/20140823/20140823123945206526.gif的小数表示中,小数点后至少连续有(  )

    A.http://picflow.koolearn.com/upload/papers/20140823/20140823123945222359.gif个零

    B.http://picflow.koolearn.com/upload/papers/20140823/20140823123945269366.gif个零

    C.http://picflow.koolearn.com/upload/papers/20140823/20140823123945284366.gif个零

    D.http://picflow.koolearn.com/upload/papers/20140823/20140823123945362371.gif个零

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  • 5已知 http://picflow.koolearn.com/upload/papers/20140823/20140823141821813400.gif的展开式中偶数项系数和为128,则第三项系数是(  )

    A.28

    B.16

    C.56

    D.8

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  • 6若( x+ http://picflow.koolearn.com/upload/papers/20140823/20140823134430705259.gif) n的展开式中前三项的系数成等差数列,则展开式中 x 4项的系数为

    A.6

    B.7

    C.8

    D.9

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  • 7http://picflow.koolearn.com/upload/papers/20140823/20140823135613767518.gif的展开式中的常数项为 http://picflow.koolearn.com/upload/papers/20140823/20140823135613783192.gif,最后一项的系数为 http://picflow.koolearn.com/upload/papers/20140823/20140823135613907197.gif,则 http://picflow.koolearn.com/upload/papers/20140823/20140823135613939239.gif的值为  (  )

    A.http://picflow.koolearn.com/upload/papers/20140823/20140823135613954213.gif

    B.http://picflow.koolearn.com/upload/papers/20140823/20140823135613970209.gif

    C.http://picflow.koolearn.com/upload/papers/20140823/20140823135614282214.gif

    D.http://picflow.koolearn.com/upload/papers/20140823/20140823135614297217.gif

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  • 8已知xy<0,且x+y=1,而 http://picflow.koolearn.com/upload/papers/20140823/20140823135146289418.gif按x的降幂排列的展开式中,第二项不大于第三项,则x的取值范围是 (     )

    A.(-∞,http://picflow.koolearn.com/upload/papers/20140823/20140823135146305220.gif

    B.[http://picflow.koolearn.com/upload/papers/20140823/20140823135146336222.gif+ http://picflow.koolearn.com/upload/papers/20140823/20140823135146351192.gif)

    C.(1,+∞)

    D.(-∞,-http://picflow.koolearn.com/upload/papers/20140823/20140823135146336222.gif]

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  • 9如果n是正偶数,则C http://picflow.koolearn.com/upload/papers/20140823/20140823133024045199.gif+C http://picflow.koolearn.com/upload/papers/20140823/20140823133024060192.gif+…+C http://picflow.koolearn.com/upload/papers/20140823/20140823133024138218.gif+C http://picflow.koolearn.com/upload/papers/20140823/20140823133024154196.gif=(   )

    A.2http://picflow.koolearn.com/upload/papers/20140823/20140823133024325178.gif

    B.2http://picflow.koolearn.com/upload/papers/20140823/20140823133024341195.gif

    C.2http://picflow.koolearn.com/upload/papers/20140823/20140823133024357198.gif

    D.(n-1)2http://picflow.koolearn.com/upload/papers/20140823/20140823133024341195.gif

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  • 10下列四个命题:① http://picflow.koolearn.com/upload/papers/20140823/20140823141251763634.png的常数项是第 http://picflow.koolearn.com/upload/papers/20140823/20140823141251794304.png项;② http://picflow.koolearn.com/upload/papers/20140823/20140823141251810601.png的前 http://picflow.koolearn.com/upload/papers/20140823/20140823141251794304.png项二项式系数之和等于后 http://picflow.koolearn.com/upload/papers/20140823/20140823141251794304.png项二项式系数之和,均等于 http://picflow.koolearn.com/upload/papers/20140823/20140823141251935446.png;③ http://picflow.koolearn.com/upload/papers/20140823/20140823141251950664.png展开式中 http://picflow.koolearn.com/upload/papers/20140823/20140823141251966287.png的正指数项的系数之和大于 http://picflow.koolearn.com/upload/papers/20140823/20140823141251966287.png的负指数项的系数之和④ http://picflow.koolearn.com/upload/papers/20140823/201408231412519971145.png的常数项是 http://picflow.koolearn.com/upload/papers/20140823/20140823141252013359.png其中正确命题的个数为(   )

    A.1

    B.2

    C.3

    D.4

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