山东省青岛市2022届高三上学期11月期中教学质量检测数学试题答案.doc
- 134****3243个人认证 |
- 2021-12-08 发布|
- 407.71 KB|
- 6页
2021.11高三期中答案
一、选择题
题号
1
2
3
4
5
6
7
8
9
10
11
12
答案
D
C
A
D
A
B
C
D
BCD
AD
AC
AD
二、填空题
13.
14.
15.
16. ,
三、
17. (本小题满分10分)
解:(1)由正弦定理得:·······
·············
·······································5分
(2)由余弦定理得:
········································8分
·······················10分
18. (本小题满分12分)
解:(1)设
又是定义在上的奇函数,
·······································6分
(2)
恒成立
是定义在上的奇函数
·············································8分
又在上递增
··················································10分
令
恒成立
···············································12分
19. (本小题满分12分)
解(1)
····································4分
单调增区间为·····························6分
(2) ,
,
的图象如图
要使在在有两个零点
·······························12分
20. (本小题满分12分)
解:(1)连接交点为,连接
,
为平行四边形
为中点,又点为棱的中点
··········································2分
面,面
面····