福建省莆田市高中数学第二章基本初等函数(Ⅰ)2.3幂函数校本作业新人教A版必修1.doc

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1、123 幂函数一 选择题1. 已知42133,5abc,则( )A B. C.bcaD.cab2. 设 1,2,则使幂函数 yx的定义域为 R 且为奇函数的所有 的值为( )A. 1,3 B. -1,1 C.-1,3 D.-1,1,33. 已知幂函数 axf的图像经过点 2,,函数 g(x)= lo()axk,若 0 时0xg无解,则 k的范围是( )A. 2k B. 1 C. 1k D.4已知函数: 22(),(),()logxfghx,当 (4,)a时,下列选项正确的是 ( ) A. ()faha B. ()()fhC. )gfD. ()fhag二填空题:5. 已知幂函数 f(x)(m 2

2、2m2) 21mx的图像与坐标轴没有交点,则m_6. 已知函数 012xf,则满足不等式 xff2的 的范围是_.7. 若关于 x的一元二次方程 032ax的两根均大于 5,求实数 a的取值范围三解答题:8已知函数 f(x)(a 23a2)x a25a5 (a 为常数),问 a 为何值时,f(x)(1)是幂函数;(2)是正比例函数;(3)是反比例函数。29. 已知幂函数 f(x)=23()kZ,若函数 f(x)为偶函数,且在(0,+ )上是增函数,求 f(x)的解析式。10. 已知函数 2()5(1)fxax(1)若函数 f(x)的定义域和值域均为 ,a,求实数 的值;(2)若函数 f(x)在区间 ,2上是减函数,且对任意的 1,xa,总有11|()|4,求实数 的取值范围;(3)若方程 f(x)=0 在 ,3上有实数解,求实数 a的取值范围。

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