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若x>0,则http://picflow.koolearn.com/upload/papers/g02/20111024/20111024145933218930.gif的最小值为

发布时间:2021-07-21

A.2

B.3

C.2http://picflow.koolearn.com/upload/papers/g02/20111024/20111024145933250871.gif

D.4

试卷相关题目

  • 1若实数a,b满足a2+b2=1,且c<a+b恒成立,则c的取值范围是

    A.(-∞,http://picflow.koolearn.com/upload/papers/g02/20110921/20110921164322062899.gif]

    B.(-∞,http://picflow.koolearn.com/upload/papers/g02/20110921/20110921164322078899.gif)

    C.[http://picflow.koolearn.com/upload/papers/g02/20110921/20110921164322109899.gif,+∞)

    D.(http://picflow.koolearn.com/upload/papers/g02/20110921/20110921164322109899.gif,+∞)

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  • 2已知a>0,b>0,a,b的等差中项是http://picflow.koolearn.com/upload/papers/g02/20111108/20111108143321078878.gif,且α=a+http://picflow.koolearn.com/upload/papers/g02/20111108/20111108143321093875.gif,β=b+http://picflow.koolearn.com/upload/papers/g02/20111108/20111108143321109878.gif,则α+β的最小值是

    A.3

    B.4

    C.5

    D.6

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  • 3已知f(x)=x+http://picflow.koolearn.com/upload/papers/g02/20111031/20111031095941718855.gif-2(x<0),则f(x)有

    A.最大值为0

    B.最小值为0

    C.最大值为-4

    D.最小值为-4

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  • 4若直线ax-by+2=0(a>0,b>0)被圆x2+y2+2x-4y+1=0截得的弦长为4,则http://picflow.koolearn.com/upload/papers/g02/20110922/20110922144808140953.gif的最小值是

    A.http://picflow.koolearn.com/upload/papers/g02/20110922/20110922144808156968.gif

    B.2http://picflow.koolearn.com/upload/papers/g02/20110922/20110922144808171888.gif+3

    C.3

    D.http://picflow.koolearn.com/upload/papers/g02/20110922/20110922144808203878.gif

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  • 5已知二次函数f(x)=ax2+ bx+c的导数为f′(x),且f"(0)> 0。若对于任意实数x都有f(x)≥0,则http://picflow.koolearn.com/upload/papers/g02/20111013/20111013101657031998.gif的最小值为

    A.3

    B.http://picflow.koolearn.com/upload/papers/g02/20111013/20111013101657046867.gif

    C.2

    D.http://picflow.koolearn.com/upload/papers/g02/20111013/20111013101657062870.gif

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  • 6设0<x<1,则http://picflow.koolearn.com/upload/papers/g02/20111012/20111012162450906987.gif的最小值为

    A.24

    B.26

    C.25

    D.1

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  • 7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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  • 8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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  • 9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

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  • 10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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