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已知0<a<1,x=logahttp://picflow.koolearn.com/upload/papers/g02/20120905/20120905105750891758.png+logahttp://picflow.koolearn.com/upload/papers/g02/20120905/20120905105750922752.png,y=http://picflow.koolearn.com/upload/papers/g02/20120905/20120905105750951580.pngloga5,z=logahttp://picflow.koolearn.com/upload/papers/g02/20120905/20120905105750981914.png﹣logahttp://picflow.koolearn.com/upload/papers/g02/20120905/20120905105751011752.png,则 

发布时间:2021-07-21

A.x>y>z

B.z>y>x

C.y>x>z

D.z>x>y

试卷相关题目

  • 1http://picflow.koolearn.com/upload/papers/20140823/20140823161058840575.gif中,实数 http://picflow.koolearn.com/upload/papers/20140823/20140823161058871192.gifhttp://picflow.koolearn.com/upload/papers/20140823/2014082316105888785.gif的取值范围是(  )

    A.http://picflow.koolearn.com/upload/papers/20140823/20140823161058918374.gif

    B.http://picflow.koolearn.com/upload/papers/20140823/20140823161058934573.gif

    C.http://picflow.koolearn.com/upload/papers/20140823/20140823161058965273.gif

    D.http://picflow.koolearn.com/upload/papers/20140823/2014082316105898085.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823161058996384.gif

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  • 2函数y = http://picflow.koolearn.com/upload/papers/20140823/20140823160835133507.gif的图象(       )

    A.关于原点对称

    B.关于直线y = -x对称

    C.关于y轴对称

    D.关于直线y = x对称

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  • 3已知 http://picflow.koolearn.com/upload/papers/20140823/20140823160853431550.gif在[0,1]上是 x的减函数,则 a的取值范围是(   )

    A.(0,1)

    B.(0,2)

    C.(1,2)

    D.[2,+∞)

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  • 4已知 http://picflow.koolearn.com/upload/papers/20140823/20140823161429737482.gif,则 http://picflow.koolearn.com/upload/papers/20140823/20140823161429752670.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823161429768667.gifhttp://picflow.koolearn.com/upload/papers/20140823/20140823161429784644.gif的大小关系为(   )

    A.http://picflow.koolearn.com/upload/papers/20140823/20140823161429799277.gif

    B.http://picflow.koolearn.com/upload/papers/20140823/20140823161429815283.gif

    C.http://picflow.koolearn.com/upload/papers/20140823/20140823161429830283.gif

    D.http://picflow.koolearn.com/upload/papers/20140823/20140823161429862278.gif

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  • 5下列各组中,指数式与对数式的互换不正确的为(   )

    A.http://picflow.koolearn.com/upload/papers/20140823/20140823162525968617.gif

    B.http://picflow.koolearn.com/upload/papers/20140823/20140823162525999625.gif

    C.b2 = a(b>0,且b≠1)与loga b =" 2"

    D.e0=1与In1=0

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  • 6已知实数a,b满足等式log2009a=log2010b,下列五个关系式: ①0<b<a<1;    ②0<a<b<1;    ③1<a<b;   ④1<b<a;   ⑤a=b. 其中不可能成立的关系式有(  )

    A.1个

    B.2个

    C.3个

    D.4个

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  • 7下列各式: ①(log23)2=210g23; ②log232=2log23; ③log26+log23=log218; ④log26-log23=log23, 其中正确的有

    A.1个

    B.2个

    C.3个

    D.4个

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  • 8已知f(x5)=lgx,则f(2)=

    A.lg2

    B.lg32

    C.http://picflow.koolearn.com/upload/papers/g02/20111205/20111205101201406945.gif

    D.http://picflow.koolearn.com/upload/papers/g02/20111205/20111205101201421946.gif

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  • 9设a>1,若对于任意的x∈[a,2a],都有y∈[a,a2]满足方程logax+logay=3,这时a的取值集合为

    A.http://picflow.koolearn.com/upload/papers/g02/20111121/20111121092917718997.gif

    B.http://picflow.koolearn.com/upload/papers/g02/20111121/20111121092917718966.gif 

    C.http://picflow.koolearn.com/upload/papers/g02/20111121/201111210929177341007.gif

    D.{2,3}

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  • 10对于给定的函数f(x)=2x-1,有下列四个结论: ①f(x)的图象关于原点对称;②f(x)在R上是增函数;③f(x)的值域为[-1,+∞);④f(|x|)有最小值为0; 其中正确结论的序号是

    A.①②

    B.②③

    C.②④

    D.①③④

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