2019 年秋季湖北省重点高中联考协作体期中考试
高三数学文科试卷
考试时间:2019 年 11 月 12 日下午 15:00 —17:00 试卷满分:150 分
★祝考试顺利★
注意事项:
1.答卷前,考生务必将自己的学校、考号、班级、姓名等填写在答题卡上。
2.选择题的作答:每小题选出答案后,用 2B 铅笔把答题卡上对应题目选项的答案信息点涂黑,
如需改动,用橡皮擦干净后,再选涂其他答案标号,答在试题卷、草稿纸上无效。
3.填空题和解答题的作答:用 0.5 毫米黑色签字笔直接答在答题卡上对应的答题区域内,答
在试题卷、草稿纸上无效。
4.考生必须保持答题卡的整?吉.考试结束后,将试题卷和答题卡一并交回。
第 I 卷 选择题(共 60 分)
一、选择题(本大题共 12 小题,每小题 5 分,共 60 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.已知复数 ,则
A. 1+3i B. 1-3i C.-1 + 3i D.-1-3i
2.已知集合 A= {-2,-1,0,1,},B={ },则
A. {-1,0,1,2} B. { 0,1,2} C. { -1,0,1} D. {-2,-1,0,1,2}
3.产品质检实验室有 5 件样品,其中只有 2 件检测过某成分含量.若从这 5 件样品中随机取出
3 件,则恰有 2 件检测过该成分含量的概率为
A. B. C. D.
4.已知向量 满足 ,则
A.5 B.-5 C.6 D.6
5.函数 的图象与圆 所围成图形较小部分的面积是
A. B. C. D.
6.已知方程 表示焦点在 轴的双曲线,则 的取值范围是
A. -2 0 (1,2)x ∈
0( ) 0h x =
1 ( 2)( ) ln 1 x
x xh x x x e
−′ = + + +
(1,2)x∈
21 ( 1) 1 1( ) ln 1 1 0x x
xh x x x e e e
−′ = + + + − > − >
∈x ∞+ ( ) 0h x′ > (1, )x∈ +∞ ( )h x 1n =
( ) ( )f x g x= ( , 1)n n +根. ···········································································································
····12 分
(二)选考题:共 10 分.请考生在第 22,23 题中任选一题作答,如果多做,则按所做
的第一题计分.
22.解: (I)由 知 所以 所以⊙C 的直
角 坐 标 方 程 为
···················································································
·······················5 分
(II)由(I)知⊙C 的标准方程为 ,即圆心 ,设 P 点坐标为
,则 ,所以当 t=0 时,
|PC| 有 最 小 值 , 此 时 P 点 坐 标 为
(6,0).·······································································································
······················10 分
23. 解 : ( I ) 由 知 , 所 以 即
;······························5 分
(II)依题意知:
······································
······················8 分
当且仅当 即 时等号成立,
所以所求式子的最大值为
.··························································································10 分
4 3sinρ θ= 2 4 3 sinρ ρ θ= 2 2 4 3x y y+ =
2 2 4 3 0x y y+ − =
2 2( 2 3) 12x y+ − = (0,2 3)C
1 3(6 , )2 2t t+ 2 2 21 3| | (6 ) ( 2 3) 482 2PC t t t= + + − = +
| |x a b+ < b a x b a− − < < − 4
6
b a
b a
− − =
− =
5
1
a
b
= −
=
2 2 2
10 5 10
5 2 ( 5) 1 ( 2 ) ( )
6(2 ) 2 3
at bt t t
t t t t
t t
+ + = − + +
= ⋅ − + ≤ + − +
= − + =
5 1
2 t t
=
−
1
3t =
2 3