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已知x>1,则http://picflow.koolearn.com/upload/papers/g02/20120801/20120801110947627586.png的最小值为

发布时间:2021-07-21

A.1

B.2

C.http://picflow.koolearn.com/upload/papers/g02/20120801/20120801110947696484.png

D.3

试卷相关题目

  • 1设M=http://picflow.koolearn.com/upload/papers/g02/20110829/20110829100500125961.gif,N=http://picflow.koolearn.com/upload/papers/g02/20110829/20110829100500140883.gif,P=http://picflow.koolearn.com/upload/papers/g02/20110829/201108291005001561036.gif,且x≠2,则有

    A.M<N<P

    B.N<M<P

    C.N<P<M

    D.P<N<M

    开始考试点击查看答案
  • 2已知过点M(1,4)的直线与两坐标轴的正半轴交于

    A.B两点,O为坐标原点,若http://picflow.koolearn.com/upload/papers/g02/20110914/201109141448260931031.gif,则四边形OACB周长的最小值等于 A.9

    B.12

    C.18

    D.20

    开始考试点击查看答案
  • 3某公司租地建仓库,每月土地占用费y1与仓库到车站的距离成反比,而每月存货物的运费y2与到车站的距离成正比。如果在距离车站10km处建仓库,费用y1与y2分别为2万元和8万元,那么要使这两项费用之和最小,仓库应建在距车站

    A.5km处

    B.4km处

    C.3km处

    D.2km处

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  • 4若a,b∈R,且ab>0,则下列不等式中,恒成立的是

    A.a2+b2>2ab

    B.a+b≥2http://picflow.koolearn.com/upload/papers/g02/20110824/20110824153948968909.gif

    C.http://picflow.koolearn.com/upload/papers/g02/20110824/201108241539489681079.gif

    D.http://picflow.koolearn.com/upload/papers/g02/20110824/201108241539490461007.gif

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  • 5某车间分批生产某种产品,每批的生产准备费用为800元。若每批生产x件,则平均仓储时间为http://picflow.koolearn.com/upload/papers/g02/20110831/20110831132653343882.gif天,且每件产品每天的仓储费用为1元。为使平均到每件产品的生产准备费用与仓储费用之和最小,每批应生产产品

    A.60件

    B.80件

    C.100件

    D.120件

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  • 6已知x>1,则函数f(x)=x+http://picflow.koolearn.com/upload/papers/g02/20120302/20120302142921216912.gif的最小值为

    A.1

    B.2

    C.3

    D.4

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  • 7已知a>0,b>0,http://picflow.koolearn.com/upload/papers/g02/20120328/20120328152936870897.gif+http://picflow.koolearn.com/upload/papers/g02/20120328/20120328152936881923.gif=1,则a+2b的最小值为

    A.7+2http://picflow.koolearn.com/upload/papers/g02/20120328/20120328152936890918.gif

    B.2http://picflow.koolearn.com/upload/papers/g02/20120328/20120328152936898906.gif

    C.7+2http://picflow.koolearn.com/upload/papers/g02/20120328/20120328152936909906.gif

    D.14

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  • 8已知x>0,y>0,lg2x+lg8y=lg2,则http://picflow.koolearn.com/upload/papers/g02/20120502/20120502161120061973.gif的最小值是

    A.2

    B.2http://picflow.koolearn.com/upload/papers/g02/20120502/20120502161120112882.gif

    C.4

    D.2http://picflow.koolearn.com/upload/papers/g02/20120502/20120502161120158881.gif

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  • 9若lga+lgb=2,则a+b的最小值是

    A.10

    B.20

    C.100

    D.200

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  • 10设P(x,y)是函数http://picflow.koolearn.com/upload/papers/g02/20111216/20111216145755609933.gif(x>0)图象上的点,则x+y的最小值为

    A.2

    B.http://picflow.koolearn.com/upload/papers/g02/20111216/20111216145755609899.gif

    C.4

    D.http://picflow.koolearn.com/upload/papers/g02/20111216/20111216145756171876.gif

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