湖北省利川市第五中学2018_2019学年高一数学上学期第15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 15 周周练试题(无答案)一、填空题(每小题 5 分,共 50 分)1、已知 f(x3)=logax,且 f(8)=1,则 a=( )A.错误!未找到引用源。 B.错误!未找到引用源。 C.2 D.32、定义在 R上的奇函数 fx满足:当 0时, 2015logxf,则方程0fx的实根的个数为( )A 1 B. 2 C. 3 D.53、函数 1mfx是幂函数,且在 0,x上为增函数,则实数 m 的值是( )A 1 B 2 C 3 D 1 或 24、设 5log4a, 5(lo)b, 4log5c,则( )A. c B.

2、a C. abc D. bac5、已知 2x7 2yA,且 1x y2,则 A 的值是A7 B7 C7 2 D986、如果二次函数 yx 2mx(m3)有两个不同的零点,则 m 的取值范围是( )A(2,6) B2,6 C2,6 D(2)(6,)7、若函数 mx|1)(的图象与 x 轴有公共点,则 m 的取值范围是( )Am1 B1m0 且 a1)的图像有两个公共点,则 a 的取值范围是_三、解答题(每小题每小题 10 分,共 20 分)17、若关于 x 的方程 3x25axa0 的一个根大于 1,另一个根小于 1,求实数 a 的取值范围18、已知函数 f(x)log a xb (a0,且 a1,b0)(1)求 f(x)的定义域;(2)讨论 f(x)的奇偶性;(3)讨论 f(x)的单调性2018 年秋高一数学第 15 周周周清答题卡- 3 -班级:_ 姓名:_ 考号:_ 分数;_一、填空题(每小题 5 分,共 50 分)题 号 1 2 3 4 5 6 7 8 9 10答 案二、填空题(每小题 5 分、共 30 分)11、_ 12、_ 13、_ 14、_15、_ 16、_ 三、解答题(每小题 10 分,共 20 分)17、18、

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