基本初等函數(shù)練習題

1、基本初等函數(shù)練習基本初等函數(shù)練習一、選擇題一、選擇題1552log10log0.25??A0B1C2D42函數(shù)的定義域是()lg(1)fxx??A(2，∞)B(1∞)C[1，∞)D[2，∞)3的值域為2()log(31)xfx??A.（0，∞）B.[0∞]C.（1，∞）D.[1，∞)4函數(shù)的定義域為1y=1exABCD??1??????1??1??(1)??5若函數(shù)=與的定義域均為，則()fx3x3x?()33xxgx???RA.與均為

2、偶函數(shù)B.為奇函數(shù)，為偶函數(shù)()fx()gx()fx()gxC.與均為奇函數(shù)D.為偶函數(shù)為奇函數(shù)()fx()gx()fx()gx6設為定義在上的奇函數(shù)，當x≥0時，=(為常數(shù))，則()fxR()fx2x2xbb(1)f??A.3B.1C.－1D.－37.函數(shù)的圖像是)1(log21??xy8.方程的解是3log24x?ABC9D333199若集合則=121|log2Axx????????RCAA.B.C.D.2(0]()2?????2(

3、)2??2(0][)2?????2[)2??18.函數(shù)121()302()0.xxfxxx?????????（1）若=1，求；0()fx0x（2）寫出定義域和值域.()fx19已知函數(shù)，（，且）()log(1)afxx??()log(42)agxx??0a?1a?（1）求函數(shù)的定義域；()()fxgx?（2）求使函數(shù)的值為正數(shù)的的取值范圍()()fxgx?x20已知函數(shù).??2()log21xfx??（1）求證：函數(shù)在內單調遞增；()f