河南省鹤壁市淇滨高级中学2018_2019学年高二数学上学期第二次周考试题文(无答案).doc

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1、 1 -鹤壁市淇滨高中 2018-2019 学年上学期第二次周考高二年级数学试卷考试时间:120 分钟;分值:150 分注意事项:1答题前填写好自己的姓名、班级、考号等信息2请将答案正确填写在答题卡上第 I 卷(选择题)一、单选题(每小题 5 分,共 60 分)1已知命题:“若 ,则 “,则原命题、逆命题、否命题、逆否命题这四x 0,y 0 xy 0个命题中,真命题的个数是 ( )A B C D 1 2 3 42设 : , : ,则 是 的 ( )p 00 a,bA 充分而不必要条件 B 必要而不充分条件C 充分必要条件 D 既不充分也不必要条件11在ABC 中,两直角边和斜边分别为 且满足

2、条件 ,试确定实数 的取值a,b,c a+b=cx x范围 ( )A B C D (1,2 (0,2 2,2) 2,312已知数列 满足 设 ,an a1+2a2+3a3+nan=(2n-1)3n bn=4nan为数列 的前 项和若 (常数) , ,则 的最小值是( )Sn bn n Sn0 x0 R,ex0 0“若 ,则 ”的逆命题是真命题.am2bm2 ab15若 , 满足约束条件 ,目标函数 的最小值为 ,则x y x+y 1x+2y 2x a Z=2x+3y 2_a=16已知数列 的前 项和为 ,且数列 是首项为 3,公差为 2 的等差数列,若an n Sn Snn,数列 的前 项和为

3、 ,则使得 成立的 的最小值为bn=a2n bn n Tn Sn+Tn 268 n_.三、解答题(17 题 10 分,其余各题均 12 分,共 70 分)17在 中,角 , , 所对的边分别是 , , ,且 .ABC A B C a b c acosC+(c-3b)cosA=0(1)求 的值;tanA(2)若 的面积为 ,且 ,求 的值.ABC 2 b-c=2 a18 的内角 , , 所对的边分别为 , , ,且 的面积 .ABC A B C a b c ABCS= 34actanB(1)求 ;B(2)若 、 、 成等差数列, 的面积为 ,求 .a b c ABC32 b- 4 -19已知命题

4、 p:“方程 有两个不相等的实根” ,命题 p 是真命题。210xm(1)求实数 m 的取值集合 M; (2)设不等式 的解集为 N,若 xN 是 xM 的充分条件,求 a 的取值a范围20(本小题满分 12 分)已知 x,y 满足条件 0147235yx求: (1)4x-3y 的最大值(2)x2+y2 的最大值(3) 的最小值58xy21记 为等差数列 的前 项和,已知 , Sn an n a1=-7 S4=-16()求 的通项公式;an()求 ,并求 的最小值Sn Sn22已知公差不为零的等差数列 的前 项和为 ,若 =110,且 成等比数列an n Sn S10 a1,a2,a4()求数列 的通项公式;an()设数列 满足 ,若数列 前 项和 bnbn= 1(an-1)(an+1) bn n Tn

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