江苏常州2020高三数学模拟考试试题
2020届高三模拟考试试卷
数 学
(满分160分,考试时间120分钟)
参考公式:
锥体的体积公式V =13
Sh ,其中S 是锥体的底面积,h 为锥体的高. 样本数据x 1,x 2,…,x n 的方差s 2=1n (x i -x -)2,其中x -=1n
x i .
一、 填空题:本大题共14小题,每小题5分,共70分.
(第3题)
1. 已知集合A ={-1,0,1},B ={x|x 2>0},则A ∩B =________.
2. 若复数z 满足z·i =1-i(i 是虚数单位),则z 的实部为________.
3. 如图是一个算法的流程图,则输出S 的值是________.
4. 函数y =2x -1的定义域是________.
5. 已知一组数据17,18,19,20,21,则该组数据的方差是________.
6. 某校开设5门不同的选修课程,其中3门理科类和2门文科类,某同学从中任选2门课程学习,则该同学“选到文科类选修课程”的概率为________.
7. 已知函数f(x)=???1x -1,x ≤0,-x 2
3,x >0,则f(f(8))=________. 8. 函数y =3sin(2x +π3
),x ∈[0,π]取得最大值时自变量x 的值为________. 9. 在等比数列{a n }中,若a 1=1,4a 2,2a 3,a 4成等差数列,则a 1a 7=________.
10. 已知cos (π2-α)cos α
=2,则tan 2α=________.
11. 在平面直角坐标系xOy 中,双曲线C :x 2a 2-y 2
b
2=1(a >0,b >0)的右顶点为A ,过A 作x 轴的垂线与C 的一条渐近线交于点B.若OB =2a ,则C 的离心率为________.
12. 已知函数f(x)=|lg(x -2)|,互不相等的实数a ,b 满足f(a)=f(b),则a +4b 的最小值为________.
13. 在平面直角坐标系xOy 中,圆C :x 2-2ax +y 2-2ay +2a 2-1=0上存在点P 到点(0,1)的距离为2,则实数a 的取值范围是________.
14. 在△ABC 中,∠A =π3,点D 满足AD →=23
AC →,且对任意x ∈R ,|xAC →+AB →|≥|AD →-AB →|恒成立,则cos ∠ABC =________.
二、 解答题:本大题共6小题,共90分. 解答时应写出必要的文字说明、证明过程或演算步骤.
15. (本小题满分14分)
在△ABC 中,角A ,B ,C 的对边分别为a ,b ,c ,已知a =1,cos B =
33
. (1) 若A =π3
,求sin C 的值; (2) 若b =2,求c 的值.
16.(本小题满分14分)
如图,在四棱锥PABCD 中,PA ⊥平面ABCD ,四边形ABCD 是矩形,AP =AD ,点M ,N 分别是线段PD ,AC 的中点.求证:
(1) MN ∥平面PBC ;
(2) PC ⊥AM.
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