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已知http://picflow.koolearn.com/upload/papers/g02/20111106/201111060914461561163.gif,则x+y的最小值为

发布时间:2021-07-21

A.12

B.14

C.16

D.18

试卷相关题目

  • 1设a>b>c>0,则http://picflow.koolearn.com/upload/papers/g02/20110907/201109070952073501309.gif的最小值是

    A.2

    B.4

    C.2http://picflow.koolearn.com/upload/papers/g02/20110907/20110907095207350883.gif

    D.5

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  • 2已知椭圆http://picflow.koolearn.com/upload/papers/g02/20111027/201110271115347031017.gif(0<b<2)与y轴交于A,B两点,点F为该椭圆的一个焦点,则△ABF面积的最大值为

    A.1

    B.2

    C.4

    D.8

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  • 3函数y=loga(x+3)-1(a>0,且a≠1)的图像恒过定点A,若点A在直线mx+ny+1=0(m>0,n>0)上,其中mn>0,则http://picflow.koolearn.com/upload/papers/g02/20110921/20110921133056484964.gif的最小值为

    A.3

    B.3+2http://picflow.koolearn.com/upload/papers/g02/20110921/20110921133056500873.gif

    C.4

    D.8

    开始考试点击查看答案
  • 4设M是△ABC内一点,且http://picflow.koolearn.com/upload/papers/g02/20120313/201203131332541091035.gif,∠BAC=30°,定义f(M)=(m,n,p)=m+n+p,其中m、n、p分别是△MBC.△MC

    A.△MAB的面积,当f(M)=(http://picflow.koolearn.com/upload/papers/g02/20110930/20110930102559750879.gif,x,y)时,http://picflow.koolearn.com/upload/papers/g02/20110930/20110930102559765933.gif的最小值是 A.8

    B.9

    C.16

    D.18

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  • 5设a>0,b>0,则下列不等式正确的有几个 ①a2+1>a; ②(a+http://picflow.koolearn.com/upload/papers/g02/20110827/20110827160851703879.gif)(b+http://picflow.koolearn.com/upload/papers/g02/20110827/20110827160851718876.gif)≥4; ③(a+b)(http://picflow.koolearn.com/upload/papers/g02/20110827/20110827160851734948.gif)≥4; ④a2+9>6a; ⑤a2+1+http://picflow.koolearn.com/upload/papers/g02/20110827/20110827160851765944.gif≥2

    A.1

    B.2

    C.3

    D.4

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  • 6设M=a+http://picflow.koolearn.com/upload/papers/g02/20110827/20110827160541218924.gif(2<a<3),N=log0.5(x2+http://picflow.koolearn.com/upload/papers/g02/20110827/20110827160541234901.gif)(x∈R),那么M、N的大小关系是

    A.M>N

    B.M=N

    C.M<N

    D.不能确定

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  • 7气象学院用32000元买了一台天文观测仪,已知这台观测仪从启用的第一天起连续使用,第n天的维修保养费为http://picflow.koolearn.com/upload/papers/g02/20110924/20110924104717406902.gif+4.9(n∈N*)元,使用它直至“报废最合算”(所谓“报废最合算”是指使用的这台仪器的平均每天耗资最少)为止,一共使用了

    A.600天

    B.800天

    C.1000天

    D.1200天

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  • 8若a>0,b>0,且2a+b=1,则S=2http://picflow.koolearn.com/upload/papers/g02/20110929/20110929155312812909.gif-4a2-b2的最大值是

    A.http://picflow.koolearn.com/upload/papers/g02/20110929/20110929155312828968.gif

    B.http://picflow.koolearn.com/upload/papers/g02/20110929/20110929155312828879.gif-1

    C.http://picflow.koolearn.com/upload/papers/g02/20110929/20110929155312859987.gif

    D.http://picflow.koolearn.com/upload/papers/g02/20110929/20110929155312875879.gif+1

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  • 9矩形ABCD中,AD=2,AB≥AD,E为AD的中点,P是AB边上一动点,当∠DPE取得最大时,AP等于

    A.2

    B.http://picflow.koolearn.com/upload/papers/g02/20110914/20110914163710859885.gif

    C.http://picflow.koolearn.com/upload/papers/g02/20110914/20110914163710859888.gif

    D.1

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  • 10下列函数最小值为4的是

    A.y=x+http://picflow.koolearn.com/upload/papers/g02/20110827/20110827160053312881.gif

    B.y=sinx+http://picflow.koolearn.com/upload/papers/g02/20110827/20110827160053328939.gif(0<x<π)

    C.y=3x+4·3-x

    D.y=lgx+4logx10

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