黑龙江齐齐哈尔市2021-2022学年高二上学期期末考试数学答案

3.0 envi 2024-09-25 4 4 410.49KB 5 页 3知币
侵权投诉
高二数学试卷参考答案及评分标准 第 1页（共 4 页）
高二数学试卷参考答案及评分标准
一.单选题：本大题共 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.
题号
1
2
3
4
5
6
7
8
答案
B
C
D
C
A
A
C
D
二.多选题：本大题共 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，部分选对得 2分.
题号
9
10
11
12
答案
AB
AB
ACD
ABD
三.填空题：本大题共 4小题，每小题 5分，共 20 分.把正确答案写在答题卡相应题的横线上.
13、
14、
48
15、1 16、
2
x
1
2
n
n
（注：第一空 2分；第二空 3分）
四.解答题：共 70 分，解答应写出文字说明、解答过程或演算步骤.
17.（10 分）
解： （1）【解法一】
直线
l
的斜率为
3
2
l
k
··················································································································································1分
ml //
直线
m
的斜率为
3
2
m
k
·························································································································2分
直线
m
的方程为
)2(
3
2
3xy
······················································································································3分
即
01332 yx
····························································································································································4分
【解法二】
ml //
直线
m
的方程为
032 Cyx
············································································································1分
直线
m
过点
1303322)3,2( CC
························································································3分
直线
m
的方程为
01332 yx
··························································································································4分
（2）易知圆心
)2,1(C
，半径
1r
······························································································································5分
圆心
C
到直线
l
的距离
13
132
13
2
32
|62312|
22
d
······································································7分
13
136
13
4
122|| 22 drAB
··················································································································9分
线段
AB
的长为
13
136
···············································································································································10分
高二数学试卷参考答案及评分标准 第 2页（共 4 页）
18.（12 分）
解：（1）设等差数列
}{ n
a
的公差为
d
109
1293
1023
122
1
1
14
52
da
da
aa
aa
1
1
1
d
a
·····································3 分
nnan1)1(1
等差数列
}{ n
a
的通项公式为
nan
···········································································5 分
（2）
n
nnb 2
··································································································································································6 分
nn
nnnS 22)1(232221 1321
①·····················································································7 分
1432 22)1(2322212
nn
nnnS
②·····················································································8 分
①－②得：
132 22222
nn
nnS
·······································································································9 分
1
2
21
)21(2
n
n
nnS
············································································································································10 分
数列
}{ n
b
的前
n
项和
22)1( 1n
nnS
············································································································12 分
19.（12 分）
解：（1）
)
3
cos(sin3
CbBc
，由正弦定理可得：
)
3
cos(sinsinsin3
CBBC
····················1分
CCCBB sin
2
3
cos
2
1
sin30sin0
·····················································································3分
3
3
tan C
··········································································································································································5分
6
0
CC
角
C
的大小为
6
·····················································································································6分
（2）
Cabbac cos2
222
bbc 612 22
·······························································································7分
22222 8233 bcabc
0236128 222 bbbbb
1b
，或
2b
···················9分
①当
1b
时，
7c
2
3
sin
2
1CabS ABC
·····························································································10分
②当
2b
时，
2c
3sin
2
1CabS ABC
································································································11分
ABC
的面积为
3
或
2
3
·········································································································································12 分
黑龙江齐齐哈尔市2021-2022学年高二上学期期末考试数学答案.pdf

共5页,预览2页

还剩页未读， 继续阅读

相关推荐

更多
立即下载
作者：envi 分类：分省 价格：3知币 属性：5 页 大小：410.49KB 格式：PDF 时间：2024-09-25

开通VIP享超值会员特权

  • 多端同步记录
  • 高速下载文档
  • 免费文档工具
  • 分享文档赚钱
  • 每日登录抽奖
  • 优质衍生服务

作者详情

相关内容

更多

推荐作者

热门标签

大联考 高考地理 英语真题 听力 语法填空 石家庄 数学竞赛 读后续写 英语阅读 深圳中学
/ 5
评分 收藏
分享
立即下载
客服
关注