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郴州市 2021 届高三上学期第二次质检
数学
(试题卷)
注意事项:
1.答题前,考生务必将自己的姓名、准考证号写在答题卡和该试题卷的封面上,并认真核对条
形码上的姓名、准考证号和科目。
2.学生作答时,选择题和非选择题均须作在答题卡上,在本试题卷上作答无效。考生在答题卡
上按答题卡中注意事项的要求答题。
3.考试结束后,将本试题卷和答题卡一并交回。
4.本试题卷共 5 页。如缺页,考生须声明,否则后果自负。
绝密★启用前
郴州市 2021 届高三第二次教学质量监测试卷
数学
(命题人:资兴市立中学 黄永行 嘉禾一中 邝玉忠 桂东一中 李毓灵 审题人:郴州一中 欧巧玲 郴
州三中 李兰兵 郴州市教科院 汪昌华)
一、单选题:本题共 8小题,每小题 5分,共 40分。在每小题给出的四个选项中,只有一项是符合题目要
求的。
1.设集合 2| 2 3 0A x x x , { | 2 3}B x x ,则 A B ( )
A. 1,3 B. 1,3 C. 1,2 D. 2,3
2.若复数 Z满足 (1 ) 2Z i i ,则下列说法正确的是( )
A. Z的虚部为 i B. Z的共轭复数为 1Z i
C. Z对应的点在第二象限 D. 2Z
3.已知 a,b是两条不同的直线,α,β是两个不同的平面,且 a ,b ,则“ //a b”是“ // ”的
( )
A充分不必要条件 B必要不充分条件
C充要条件 D既不充分也不必要条件
4.《易·系辞上》有“河出图,洛出书”之说,河图、洛书是中国古代流传下来的两幅神秘图案,蕴含了深
奥的宇宙星象之理,被誉为“宇宙魔方”,是中华文化阴阳术数之源.河图的排列结构如图 1所示,一与六共
宗居下,二与七为朋居上,三与八同道居左,四与九为友居右,五与十相守居中,其中白圈数为阳数,黑
点数为阴数,若从阳数和阴数中各取一数,则其差的绝对值大于 5的概率为( )
A.
4
25
B.
7
25
C.
8
25
D.
2
5
5.已知单位向量 a,满足等式 2 | | | |a b
, | 2 | 13a b
,则 a与b
的夹角为( )
A.120° B.90° C.60° D.30°
6.随着科学技术的发展,放射性同位素技术已经广泛应用于医学、航天等众多领域,并取得了显著经济效益.
假设在放射性同位素钍 234 的衰变过程中,其含量 N(单位:贝克)与时间 t(单位:天)满足函数关系
24
0( ) 2
t
N t N
,其中 0N 为 0t 时钍 234的含量.已知 24t 时,钍 234含量的瞬时变化率为 8ln 2 ,则
(96)N ( )
A.12贝克 B.12ln 2贝克 C.24贝克 D. 24ln 2贝克
7.如图 2,设椭圆 1C :
2 2
2 2 1x y
a b
( 0a b )与双曲线 2C :
2 2
2 2 1x y
m n
( 0m , 0n )的公共焦
点为 1F , 2F ,将 1C , 2C 的离心率分别记为 1e , 2e ,点 A是 1C , 2C 在第一象限的公共点,若点 A关于 2C
的一条渐近线的对称点为 1F ,则 2 2
1 2
2 2
e e
( )
A.2 B.
5
2
C.
7
2
D.4
8.已知可导函数 ( )f x 的导函数为 ( )f x ,若对任意的 xR ,都有 ( ) ( ) 2f x f x ,且 ( ) 2021f x 为奇
函数,则不等式 ( ) 2019 2xf x e 的解集为( )
A. (0, ) B. ( ,0) C. ( , )e D.
1 ,
e
二、多选题:本题共 4小题,每小题 5分,共 20分。在每小题给出的选项中,有多项符合题目要求。全部
选对的得 5分,有选错的得 0分,部分选对的得 3分。
9.2020年初,突如其来的疫情改变了人们的消费方式,在目前疫情防控常态化背景下,某大型超市为了解
人们以后消费方式的变化情况,更好的提高服务质量,收集并整理了本超市 2020年 1月份到 8月份的线上
收入和线下收入的数据,并绘制如下的折线图 3.根据折线图,下列结论正确的是( )
A.根据该超市这 8个月折线图可知,线下收入的平均值在 7,8 内
B.根据该超市这 8个月折线图可知,线上收入的极差比线下收入的极差大
C.根据该超市这 8个月折线图可知,每月总收入与时间呈现负相关
D.根据该超市这 8个月折线图可知,在疫情逐步得到有效控制后,人们比较愿意线下消费
10.已知函数 ( ) sin( )f x x ( 0 ,| |
2
)的最小正周期为 2 .把函数 ( )f x 的图象向左平移
2
3
个单位长度得到的图象对应的函数为偶函数,则( )
A.
6
B. ,0
6
是 ( )f x 的图象的对称中心
C. ( )f x 在 0,
2
上单调递增 D. ( )f x 在 0, 上的值域为
1 ,1
2
11.已知抛物线 C: 2 4y x 的焦点为 F, 1 1,P x y , 2 2,Q x y 是抛物线上两点,则下列结论正确的是( )
A. C的准线方程: 1x
B.若直线 PQ过点 F,则 1 2 4x x
C.若
5| | | |
2
PF QF ,则线段 PQ的中点 M到 y轴的距离为
1
4
D.若 PF QF
,则 2OPQS △
12.已知5 3a ,8 5b ,则( )
A. a b B.
1 1 2
a b
C.
1 1a b
a b
D. b aa a b b
三、填空题:本题共 4小题,每小题 5分,第 15题第一问 2分,第 2问 3分,共 20分。
13. tan 765 __________.
14.已知圆 O的半径为 5, 4OP ,过点 P的 2021条弦的长度组成一个等差数列 na ,最短弦长为 1a ,最
长弦长为 2021a ,则公差 d __________.
15.定义:在等式中 2 0 2 1 2 1 2 2 2 2 1 22
n n n n n n
n n n n nx x D x D x D x D x D (
*n N )中,把
0
nD ,
1
nD ,
2
nD ,…
2n
nD 叫做三项式 2 2
n
x x 的 n次系数列(如三项式的 1次系数列是 1,-1,-2).则(1)
三项式 2 2
n
x x 的 2次系数列各项之和等于__________;(2) 9
5D __________.
16.如图 4,已知球 O是直三棱柱 1 1 1ABC ABC 的外接球, 1 6AC BC CC , AC BC ,E,F分别
为 1BB , 1 1AC 的中点,过点 A,E,F作三棱柱的截面α,若α交 1 1BC 于 M,过点 M作球 O的截面,则所得
截面圆面积的最小值是__________.
四、解答题:本大题共 6小题,共 70分。解答应写出文字说明、证明过程或演算步骤。
17.(本小题满分 10分)
设 na 为等差数列, nb 是正项等比数列,且 1 1 2a b , 3 22a b .在① 5 3 112b b b ,② 5 42a b ,
③ 2 2 1log log 1n nb b , 2n ,
*n N 这三个条件中任选一个,求解下列问题:
(Ⅰ)写出你选择的条件并求数列 na 和 nb 的通项公式;
(Ⅱ)在(Ⅰ)的条件下,若 n n nc a b (
*n N ),求数列 nc 的前 n项和 nS .
18.(本小题满分 12分)
如图 5,在平面四边形 ABCD中, AB AD , 1AB , 3AD , 2BC .
(I)若 2 2CD ,求四边形 ABCD的面积;
(Ⅱ)若
7cos
5
BCD , 0,
2
ADC
,求 sin ADC .
19.(本小题满分 12分)
如图 6,在直四棱柱 1 1 1 1ABCD ABC D 中,四边形 ABCD为平行四边形,M为 1AA 的中点, 1BC BD ,
1 2AB AA .
(Ⅰ)求证:平面 BMD 平面 BDC;
(Ⅱ)求二面角 1 1D MC C 的正弦值.
20.(本小题满分 12分)
已知椭圆 C:
2 2
2 2 1x y
a b
( 0a b )的离心率为
3
3
,直线 5 0x y 与椭圆 C有且只有一个公共
点.
(Ⅰ)求椭圆 C的标准方程
(Ⅱ)设点 ( 3,0)A , ( 3,0)B ,P为椭圆 C上一点,且直线 PA与 PB的斜率乘积为
2
3
,点 M,N是
椭圆 C上不同于 A,B的两点,且满足 //AP OM , //BP ON,求证: OMN△ 的面积为定值.
21.(本小题满分 12分)
已知函数 ( ) 1 lnxf x ae x
(Ⅰ)当 1a ,讨论函数 ( )f x 的单调性;
(Ⅱ)若不等式 ( ) x af x e x x ( 0a ),对 (1, )x 恒成立,求实数 a的取值范围.
22.(本小题满分 12分)
垃圾分类,是指按一定规定或标准将垃圾分类储存、分类投放和分类搬运,从而转变成公共资源的一系列
活动的总称.分类的目的是提高垃圾的资源价值和经济价值,力争物尽其用.垃圾分类后,大部分运往垃圾处
理厂进行处理.为了监测垃圾处理过程中对环境造成的影响,某大型垃圾处理厂为此建立了 5套环境监测系
统,并制定如下方案:每年工厂的环境监测费用预算定为 80万元,日常全天候开启 3套环境监测系统,若
至少有 2套系统监测出排放超标,则立即检查污染处理系统;若有且只有 1套系统监测出排放超标,则立
即同时启动另外 2 套系统进行 1 小时的监测,且后启动的这 2 套监测系统中只要有 1套系统监测出排放超
标,也立即检查污染处理系统.设每个时间段(以 1小时为计量单位)被每套系统监测出排放超标的概率均
为 p(0 1p ),且各个时间段每套系统监测出排放超标情况相互独立.
(Ⅰ)当
1
2
p 时,求某个时间段需要检查污染处理系统的概率;
(Ⅱ)若每套环境监测系统运行成本为 20元/小时(不启动则不产生运行费用),除运行费用外,所有的环
境监测系统每年的维修和保养费用需要 6万元.现以此方案实施,问该工厂的环境监测费用是否会超过预算
(全年按 9000小时计算)?并说明理由.
郴州市 2021 届高三第二次教学质量监测试卷
数学参考答案及评分细则
一、选择题:本题共 8小题,每小题 5分,共 40分。在每小题给出的四个选项中,只有一项是符合题目要
求的。
1-5 BCDAC 6-8 CDA
二、多选题:本题共 4小题,每小题 5分,共 20分。在每小题给出的四个选项中,多项是符合题目要求的。
全部选对得 5分,有选错得 0分,部分选对得 3分。
9.AD 10.BCD 11.ACD 12.ABD
三、填空题:本题共 4小题,每小题 5分,第 16题第一问 2分,第 2问 3分,共 20分。
13.1 14.
1
505
15.(1)4 (2)-80 16.8
四、解答题:本大题共 6小题,共 70分。解答应写出文字说明、证明过程或演算步骤。
17.(Ⅰ)选择①:设 na 的公差为 d, nb 的公比为 q( 0q ).
则根据题意有 4 2
2 2 4
2 2 24
d q
q q
,·················································································(2分)
解得
2
3
q
d
·············································································································(4分)
所以, 2 3( 1) 3 1na n n 12 2 2n n
nb
·························································(5分)
选择②:设 na 的公差为 d, nb 的公比为 q( 0q ).
则根据题意有 3
2 2 4
2 4 2 2
d q
d q
,···············································································(2分)
解得
2
3
q
d
·············································································································(4分)
所以 2 3( 1) 3 1na n n ,
12 2 2n n
nb
.·····················································(5分 )
选择③:由 2 2 1log log 1n nb b , 2n ,
*n N 得
2 2 1log log 1n nb b ∴
1
2n
n
b
b
··············································································(2分)
∴ nb 的公比为 2q 又 2 2 4d q ∴ 3d ·····························································(4分)
所以 2 3( 1) 3 1na n n ,
12 2 2n n
nb
.···························································(5分)
(Ⅱ)由(Ⅰ)可知 (3 1) 2nnc n ············································································(6分)
2 32 2 5 2 8 2 (3 1) 2nnS n ①
2 3 12 2 2 5 2 (3 4)2 (3 1)2n n
nS n n ②···················································· (7分)
①-②得
2 3 12 2 3 2 3 2 3 2 (3 1) 2n n
nS n ············································(8分)
2 3 14 3 2 2 2 (3 1)2n nn ········································································(9分)
∴
2
12 2 24 3 (3 1)2
1 2
n
n
nS n
1(3 4)2 8nn ···································································································(10分)
18.(Ⅰ)连接 BD,在Rt ABD△ 中
由勾股定理得:
2 2 2 4BD AB AD ,所以 2BD ·················································(1分)
在 BCD△ 中,由余弦定理知:
2 2 2 3cos
2 4
BC CD BDC
BC CD
·····································(3分)
∴
2 7sin 1 cos
4
C C ··················································································· (4分)
所以
1 7sin
2 2BCDS BC CD C △ ,
1 3
2 2ABDS AB AD △ ···································· (5分)
所以 ABCD的面积
3 7
2ABD BCDS S S
△ △ ························································· (6分)
(Ⅱ)由
7cos
5
BCD 得
3 2sin
5
BCD ·····························································(7分)
在 BCD△ 中,由正弦定理知:
sin sin
BC BD
BDC BCD
所以
sin 3sin
5
BC BCDBDC
BD
·········································································(8分)
因为 0,
2
ADC
,所以 0,
2
BDC
,
4cos
5
BDC ····································(9分)
在Rt ABD△ 中,
3tan
3
ABADB
AD
,所以
6
ADB
······································(10分)
所以
3 3 4 1 4 3 3sin sin
6 5 2 5 2 10
ADC BDC
··································(12分)
19.(Ⅰ)因为 1BC BD , 2CD AB .可得
2 2 2BC BD CD ,
∴ BD BC ,又∵ //AD BC,∴ BD AD .
又∵ 1 1 1 1ABCD ABC D 是直四棱柱,
∴ 1DD 平面 ABCD .∴ 1DD BD .
1DD AD D ,∴ BD 平面 1 1ADD A,
∴ BD MD .··········································································································(2分)
法一:取 1BB 中点 N,连接 NC,MN,
∵ //MN DC ,∴四边形MNCD为平行四边形,∴ //MD NC,
∵
1
2
2
NB BC
BC CC
,∴ 1NBC BCC∽△ △ ,∴ 1 90C BC BCN ,∴ 1BC CN ,
又∵ //MD NC,∴ 1MD BC .···················································································(4分)
又 1BC BD B ,∴MD 平面 1BDC .······································································(5分)
又MD 平面MBD,所以平面 BMD 平面 1BDC .······················································ (6分)
法二:连接 1 1AC ,可计算得 1
22
2
C M ,
6
2
MD , 1 2C D ,
所以
2 2 2
1 1MD C D MC ,由勾股定理的逆定理得: 1MD DC ,余同法一
(Ⅱ)以DA为 x轴,DB为 y轴, 1DD 为 z轴,建立如图所示的坐标系,
则 (0,1,0)B , 1( 1,1, 2)C , 1(0,0, 2)D ,
21,0,
2
M
∴ 1
22,1,
2
MC
, 1 (0,0, 2)CC
, 1 1 ( 1,1,0)DC
············································ (7分)
设平面 1C CM 的法向量为 ( , , )n x y z ,由
1
1
0
0
CC n
MC n
得
2 0
2 3 0
z
x y z
可求得一个法向量
(1,2,0)n ············································································································· (8分)
同理可得平面 1 1DC M 的一个法向量 (1,1, 2)m ························································· (10分)
设二面角 1 1D MC C 的大小为θ
所以
| | 3 3 5| cos | | cos , |
| || | 102 5
m nm n
m n
·····················································(11分)
则
55sin
10
,即二面角 1M BC D 的正弦值为
55
10
.·············································(12分)
20.解:(Ⅰ)∵直线 5 0x y 与椭圆有且只有一个公共点,
∴直线 5 0x y 与椭圆 C:
2 2
2 2 1x y
a b
( 0a b )相切,
∴ 2 2
2 2
5 0
1
x y
x y
a b
2 2 2 2 2 2 22 5 5 0b a x a x a a b ·········································· (3分)
∴
2 20 5a b
又∵
3
3
c
a
,∴ 3a ,∴
2 2 2 2b a c ,
椭圆 C的方程为
2 2
1
3 2
x y
.······················································································(5分)
(Ⅱ)证明:由题意 M、N是椭圆 C上不同于 A,B的两点,
由题意知,直线 AP, BP斜率存在且不为 0,又由已知
2
3AP BPk k .
由 //AP OM , //BP ON,所以
2
3OM ONk k ······························································ (6分)
设直线MN的方程为 x my t ,
代入椭圆方程得 2 2 22 3 4 2 6 0m y mty t ①······················································(7分)
设 1 1,M x y , 2 2,N x y ,
则 1 2 2
4
2 3
mty y
m
,
2
1 2 2
2 6
2 3
ty y
m
······································································(8分)
又
2
1 2 1 2
2 2 2 2
1 2 1 2 1 2
2 6 2
3 6 3OM ON
y y y y tk k
x x m y y mt y y t t m
···································(9分)
得
2 22 2 3t m ·····································································································(10分)
所以
2 2
1 2 2 2
1 1 48 24 72 1 2 6 | | 6| | | | | |
2 2 2 3 2 2 2MON
m t tS t y y t t
m t
△
即 MON△ 的面积为定值
6
2
·················································································(12分)
21.解:(Ⅰ) ( )f x 的定义域为 (0, ) ,
1( ) lnxf x e x
x
,······································ (1分)
令
1( ) lng x x
x
,则 2 2
1 1 1( ) xg x
x x x
,·····························································(2分)
当 (0,1)x 时, ( ) 0g x , ( )g x 单调递减,
当 (1, )x 时, ( ) 0g x , ( )g x 单调递增,····························································· (3分)
∴ 1x 时, ( )g x 取得极小值即最小值 (1) 1g ,
∴ ( ) 0f x 在 (0, ) 恒成立,·················································································· (4分)
∴ ( )f x 在 (0, ) 单调递增;·····················································································(5分)
(Ⅱ)不等式 ( ) x af x e x x 等价于 ln ln lnx a x x a ae x x a x e e x x ,······(6分)
设 ( ) lnk t t t ,即 x ak e k x (*)
∵
1 1( ) 1 tk t
t t
·································································································(7分)
∴当 (0,1)t , ( ) 0k t , ( )k t 在 (0,1)是减函数
(1, )t , ( ) 0k t , ( )k t 在 (1, ) 是增函数 ·························································(8分)
∵ (1, )x ,
10 1xe e ·············································································· (9分)
当 0a 时, 0 1ax ,且 ( )k t 在 (0,1)是减函数
则(*)式
ln
x a xe x a
x
令 ( )
ln
xh x
x
( 1x ),则 2
ln 1( )
(ln )
xh x
x
,······························································(10分)
当 (1, )x e 时, ( ) 0h x , ( )h x 单调递减,
当 ( , )x e 时, ( ) 0h x , ( )h x 单调递增,····························································(11分)
min( ) ( )h x h e e a e ∴ a e 又 0a ∴ 0e a ·································(12分)
22.(Ⅰ)设某个时间段在需要开启 3套系统就被确定需要检查污染源处理系统的事件为 A
2 3 3 3
2 2 3 3 2 3 2 3
3 3 3 3 3 3
1 1 1 1 1 1( ) (1 )
2 2 2 2 2 2
P A C p p C p C C C C
,···············(2分)
设某个时间段在需要开启另外 2套系统才能确定需要检查污染源处理系统的事件为 B
3 2
1 2 2 1
3 3
1 1 9( ) (1 ) 1 (1 ) 1
2 2 32
P B C p p p C
···········································(5分)
∴某个时间段需要检查污染源处理系统的概率为
1 9 25
2 32 32
··········································· (6分)
(Ⅱ)设某个时间段环境监测系统的运行费用为 X元,则 X的可能取值为 60,100.···············(7分)
1 2
3( 100) (1 )P X C p p 1 2
3( 60) 1 (1 )P X C p p ···············································(8分)
1 2 1 2 2
3 3( ) 60 1 (1 ) 100 (1 ) 60 120 (1 )E X C p p C p p p p
令
2( ) (1 )g p p p , (0,1)p ,则
2( ) (1 ) 2 (1 ) (3 1)( 1)g p p p p p p .··············(9分)
当
10,
3
p
时, ( ) 0g p , ( )g p 在
10,
3
上单调递增,
当
1 ,1
3
p
时, ( ) 0g p , ( )g p 在
1 ,1
3
上单调递减,············································(10分)
∴ ( )g p 的最大值为
1 4
3 27
g
,·············································································(11分)
∴实施此方案,最高费用为
446 9000 60 120 10 76
27
(万元),
∵76 80 ,故不会超过预算.····················································································(12分)
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