湖北省利川市第五中学2018_2019学年高一数学上学期第13周周练试题(无答案).doc

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1、 1 -湖北省利川市第五中学 2018-2019 学年高一数学上学期第 13 周周练试题(无答案)一、填空题(每小题 5 分,共 40 分)1、给出下列函数:(1) 2xy;(2) 2yx;(3) 1yx;(4) 21yx;(5)23yx,其中是幂函数的序号为( )A (2) (3) B (1) (2) C (2) (3) (5) D (1) (2) (3)2、 10log+log 225 的值是( )A 0 B 1 C 2 D33、函数 23xf的单调减区间为 ( )A. , B. , C. 1, D. ,24、函数 20.4log(3)yx的值域是( )A.( 0,2 B.2,+) C.

2、2 D.2,+)5、已知 1.235,l6,log10abc,则 ,abc的大小关系是( )A. c B. a C. D. acb6、若 0x是方程 lx的解,则 0x属于区间( )A 1(,)2B (,)C 2,1 D 3, 7、设函数2()0xbcf,若 (4)0ff, (2)f,则关于 x的方程()fx的解的个数为 ( )A.1 B.2 C.3 D.48、已知函数 52log1,()()xfx,则关于 x的方程 1(2)fax,当12a的实根个数为( )A.5 B.6 C.7 D.8二、填空题(共 4 小题,每小题 5 分,共 20 分)- 2 -9、若 1420x,则 x 10、若

3、2x2,则函数 的值域为 _11、已知函数 在区间 上是减函数,则实数 的取值范围为_12、已知函数 21,0,4xfxg若方程 0gfxa的实数根的个数有 4 个,则 a的取值范围是 _三、解答题(每小题每小题 10 分,共 40 分)13、计算:(1) 41 130.753 20.64216(2) 74log23 97logl5l14、已知 20.5()l()fxmx(1)若函数 的值域为 R,求实数 的取值范围;(2)若函数 ()fx在区间 (,13)上是增函数,求实数 m的取值范围15、设 )1,0(logl axaa ,且 2)(f(1)求 的值及 )(xf的定义域;(2)求 f在区间 032,上的最大值.16、已知函数 21logxfx(1)求 120707ff的值;(2)判断并证明函数 fx的单调区间

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