江苏省泰州市高中数学第3章指数函数、对数函数和幂函数3.2对数函数(一)同步训练(无答案)苏教版必修1.doc

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1、1对数函数(一)一、填空题1给出下列函数: y 23logx2; ylog 3(x1); ylog (x1) x; ylog x.其中是对数函数的是_(填序号)2若 f(x)log ax( a24 a5)是对数函数,则 a_.3设集合 M 1|,0)xy, N y|ylog 2x, x(0,1,则集合 M N等于_4已知函数 f(x)log a(x2),若图象过点(6,3),则 f(2)的值为_5已知函数 ylog a(x3)1 的图象恒过定点 P,则点 P的坐标是_6已知函数 f(x)log a|x1|在(1,0)上有 f(x)0,那么 f(x)的单调增区间是_7.已知函数 f(x)的图象如

2、图所示,则函数 g(x) 2lo()fx的定义域是_8设 alog 2, b 12log, c 2 ,则 a, b, c的大小关系是_9已知函数 f(x)|lg x|,若 0f(2),求 a的取值范围;(2)求 ylog 2(2x1)在2,14上的最值213已知函数 f(x)log a(1 x), g(x)log a(1 x)(a0,且 a1)(1)设 a2,函数 f(x)的定义域为3,63,求函数 f(x)的最值;(2)求使 f(x) g(x) 0的 x的取值范围三、探究与拓展14已知 loga(3a1)恒为正,则 a的取值范围是_15已知 1 x4,求函数 f(x)log 2 log2 的最大值与最小值x4 x2

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