鲁京津琼专用2020版高考数学大一轮复习第十二章概率随机变量及其分布模拟试卷一课件
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1、模拟试卷(一),一、选择题(本大题共12小题,每小题5分,共60分) 1.设集合Ax|1x2,Bx|2x1,则AB等于 A. 0,2) B.0,1) C.(1,0 D.(1,0),解析 由题意得Bx|2x1x|x0,又Ax|1x2, ABx|0x20,2).故选A.,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,故选B.,3.下列函数中,既是偶函数,又在(,0)上单调递增的是 A.f(x)2x2x B.f(x)x2
2、1 C.f(x)xcos x D.f(x)ln|x|,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,解析 A中,f(x)2x2xf(x),不是偶函数,A错; B中,f(x)(x)21x21f(x),是偶函数,但在(,0)上单调递减,B错; C中,f(x)xcos(x)xcos xf(x),不是偶函数,C错; D中,f(x)ln|x|ln|x|f(x),是偶函数,且函数在(,0)上单调递增,故选D.,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,4.设等比数列a
3、n的前n项和为Sn,且Snk2n3,则ak等于 A.4 B.8 C.12 D.16,解析 当n2时,anSnSn1k2n1; 当n1时,a1S12k3k211,解得k3, aka3323112. 故选C.,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,1,2,3,4,5,6,7,8,9,10,11,12
4、,13,14,15,16,17,18,19,20,21,22,结合各选项可得C符合题意. 故选C.,7.函数f(x) 有两个不同的零点,则实数a的取值范围是 A.a2 B.a2,故选C.,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,8.(2019安徽省江淮名校试题)RtABC的斜边AB等于4,点P在以C为圆心,1为半径的圆上,则 的取值范围是,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
5、,16,17,18,19,20,21,22,9. (1x)5的展开式中x2的系数为 A.1 B.9 C.31 D.19,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,10.如图,B是AC上一点,分别以AB,BC,AC为直径作半圆.过B作BDAC,与半圆相交于D. AC6,BD ,在整个图形中随机取一点,则此点取自图中阴影部分的概率是,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17
6、,18,19,20,21,22,解析 连接AD,CD, 可知ACD是直角三角形,又BDAC,所以BD2ABBC,设ABx(0x6),则有8x(6x),得x2或x4,当x2时,AB2,BC4, 由此可得图中阴影部分的面积等于,故选C.,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,解析 由题意,矩形的对角线长相等,,4a2b2(b23a2)c2, 4a2(c2a2)(c24a2)c2, e48e240,,故选C.,1
7、,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,12.设正三棱锥PABC的每个顶点都在半径为2的球O的球面上,则三棱锥PABC体积的最大值为,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,故选C.,二、填空题(本大题共4小题,每小题5分,共
8、20分),1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,13.已知向量a,b的夹角为45,且|a|b|2,则a(a b)_.,0,14.若函数f(x)(a1)x3ax22x为奇函数,则曲线yf(x)在点(1,f(1)处的切线方程为_.,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,解析 f(x)(a1)x3ax22x为奇函数,则a0, f(x)x32x, f(x)3x22,f(1)31221,又f(1)1, 曲线yf(x)在点(1,f(1)处的切线方程为y1x1,即xy2
9、0.,21,22,xy20,15.(2019安徽省江淮名校联考)已知正数a,b满足ab1,则 的最大值为_.,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,解析 令xa1,yb2,则xy4,,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,16.设mR,若函数f(x)|x33xm|在x0, 上的最大值与最小值之差为2,则实数m的取值范围是_.,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,(,2
10、0,),1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,则g(x)3x233(x1)(x1),,2m0或m0, 解得m2或m0. 实数m的取值范围为(,20,).,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,三、解答题(本大题共70分) 17.(10分)设Sn为等差数列an的前n项和,S981,a2a38. (1)求an的通项公式;,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,故an1(n1
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