山西省吕梁市高级中学2018_2019学年高一数学上学期期中试题.doc

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1、 1 -2018 年秋季学期高一期中考试(数学)试题(时间:120 分钟 满分:150 分 )第 I 卷一、选择题(12 个小题,每小题 5 分,共 60 分)1. 设集合 A=xN|3x0,且 a1)在(0,+)内单调递减,则 f(a+1)与 f(2)的大小关系2为( )A.f(a+1)=f(2) B.f(a+1)f(2) C.f(a+1)0,且 a1) .(1)求函数 f(x)+g(x)的定义域;(2)求使 f(x)-g(x)0 的 x 的取值范围 .- 5 -2018 年秋季学期高一期中考试(数学)答案1.C 2.C 3.A 4.B 5.C 6.B 7.C 8.A 9.D 10.D 1

2、1.D 12.B13.2 14.1 15. 16.0,1217.(1)原式 = ( 2)原式 =36log32- 25*4lg= =log22- 10l2= =013= 418. ( 1) ,102xBA72xACR或( 2) a19. 解:( 1)函数的定义域为 ,-为奇函数,则 ,即 ,得)(xf )1(ffm1- 0( 3) 由( 1)知 ,该函数在 上为增函数x)), (, 0证明:任取 ,212,0(,x且 设则 =12121 )( xff 2由 ,有 ,即0,2121xx 0)(1ff )(21xff有 在 上为增函数)(f),( 同理可得 在 上也为增函数x),( -综上,函数在 上为增函数 .),) , (,( 020. 解:由题有 得21bc1b- 6 -( 1) ;1)(2xf( 2) 结合图像可得, , .8)3()(maxff 1)0()(minfxf21. 解:( 1)设 ,则 ,有 ,0-2函数 为奇函数,则 ,)(xf xfxf1)()且 ,所以0f 0,21(fx(解析式答案形式不唯一)(2) 图略 .22. 解:( 1)由题有 得0x1-x则函数 ;)的 定 义 域 为 ( ,)(gxf( 2)由题有 x1) 当 时, ,得a011x2) 当 时, ,得 .00-

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