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高一数学周练(十一)教师版

高一数学周练(十一)教师版
高一数学周练(十一)教师版

高一数学周练(十一)

1.已知x x f 3cos )(cos =,则

)30(sin f 的值为 .

2.已知α为第四象限角,且3

1)75cos(-=-

α,则)105sin(α+ 的值为 . 3.在平面直角坐标系中,(0,0),(6,8)O P ,将OP 绕坐标原点O 按逆时针旋转

2

π

后,得OQ ,则点Q 的坐标是 .

4.已知函数)(x f y =定义域为??

????4

1,0,求函数)(sin 2x f y =

的定义域为 .

5.若函数)0(sin )(>=ωωx x f 在区间??????3,0π上单调递增,在区间??

?

???2,3ππ上单调递减,则

ω________.

6.函数cos 1

()()

x

f x =在[],ππ-上的减区间为____________ .

11.设函数)5

2

sin(

2)(π

π

+

=x x f ,对任意R x ∈,都有)()()(21x f x f x f ≤≤成立,则||21x x -的最

小值为 .

12.函数y =2sin(π3-x )-cos(π

6

+x )(x ∈R )的最小值是

13.函数x

x

y cos 2cos 2-+=

的最大值为_______。

14.已知函数()??? ?

?

≤≤++--=20sin cos 4212πx x x a a x f 的最大值为2,则实数a = 15.已知函数11

()(sin cos )sin cos 22

f x x x x x =

+--,则()f x 的值域是 16.定义域为[-2,1]的函数)(x f 满足)(2)1(x f x f =+,且当]1,0[∈x 时,x x x f -=2

)(。若方程

m x f =)(有4个根,则m 的取值范围为 . 【答案】

),(16

1-8

1

- 17.已知函数=

)(x f )4

2sin(2π

-

x .

(1)利用“五点法”,按照列表-描点-连线三步,画出函数一个周期....的图象; (2)求出函数)(x f 的所有对称中心的坐标; (3)当∈x ]8

,2[π

π-时,0)(=-a x f 有解,求实数a 的取值范围.

18.已知函数()cos(2)(0)6

f x a b x b π

=-+

≠,的最大值为

32,最小值为12

-

(1)求a ,b 的值;(2)求函数()4sin()3g x ax b π

=--+的单调递增区间; (3)当b >0时,求()4sin()3g x ax b π

=--+的对称中心和对称轴方程.

19.已知函数()22

x x a

f x =-(a R ∈),将)(x f y =的图象向右平移两个单位,得到函数 )(x

g y =的图象,函数)(x

h y =与函数)(x g y =的图象关于直线1=y 对称. (1)求函数)(x g y =和)(x h y =的解析式;

(2)若方程a x f =)(在]1,0[∈x 上有且仅有一个实根,求a 的取值范围;

(3)设)()()(x h x f x F +=,已知a x F 32)(+>对任意的),(∞+∈1x 恒成立,求a 的

取值范围.

【解析】(Ⅰ)()()2

2

2

2

2---

=-=x x a x f x g .

设()x h y =的图像上一点()y x P ,,点()y x P ,关于1=y 的对称点为()y x Q -2,, 由点Q 在()x g y =的图像上,所以y a x x -=---22

22

2, 于是2

2222--+

-=x x a

y 即()2

22

22--+

-=x x a

x h .

(Ⅱ)设x

t 2=,]1,0[∈x ,∴]2,1[∈t .

a a x x =-2

2得a t a

t =-,即02=--a at t 在]2,1[∈t 上有且仅有一个实根.

设a at t t k --=2

)(,对称轴2

a t =.

若()10k =,则12a =,两根为121

1,2t t ==-.适合题意;

若()20k =,则43a =,两根为122

2,3

t t ==-.适合题意.

若在()1,2内有且仅有一个实根, 则

(1)(2)0k k ?<① 或 0122

a

?=??

?≤≤??② 综上知14,.23a ??

∈????

(Ⅲ)223243)()()(++?=+=x x a x h x f x F . 由a x F 32)(+>,化简得a a

x x >+?2

241,

设x t 2=,),2(+∞∈t . 即0442

>+-a at t 对任意),2(+∞∈t 恒成立.

设a at t t m 44)(2

+-=,对称轴a t 2=

则016162

<-=?a a ③ 或 ?????≥≤≥-=?0)2(22016162m a a a ④

由③得10<

?

??≤≤≥≤1110a a a a 或,即0≤a 或1=a .

综上,(],1a ∈-∞.

20.已知函数)(x f ,如果存在给定的实数对(b a ,),使得b x a f x a f =-?+)()(恒成立,则称)(x f 为“S-函数”. (1)判断函数

x x f x x f 3)(,)(21==是否是“S-函数”;

(2)若x x f tan )(3=是一个“S-函数”,求出所有满足条件的有序实数对),(b a ;

(3)若定义域为R 的函数)(x f 是“S-函数”,且存在满足条件的有序实数对)1,0(和)4,1(,当

]1,0[∈x 时,)(x f 的值域为]2,1[,求当]2012,2012[-∈x 时函数)(x f 的值域.

22.【解析】(1)若x x f =)(1是“S-函数”,则存在常数),(b a ,使得 (a+x)(a-x)=b . 即x 2

=a 2

-b 时,对x ∈R 恒成立.而x 2

=a 2

-b 最多有两个解,矛盾, 因此x x f =)(1不是“S-函数”.

若x x f 3)(2=是“S-函数”,则存在常数a ,b 使得a x a x

a 2333=?-+,

即存在常数对(a, 32a

)满足. 因此x

x f 3)(2=是“S-函数”;

(2)x x f tan )(3=是一个“S-函数”,设有序实数对(a , b )满足:则tan(a-x)tan(a+x)=b 恒成立.

当a=Z k k ∈+

,2

π

π时,tan(a-x)tan(a+x)= -cot 2(x),不是常数.

因此Z k k a ∈+

≠,2

π

π,Z m m x ∈+

≠,2

π

π,

则有b x

a x

a x a x a x a x a =--=?-+??+-2

222tan tan 1tan tan tan tan 1tan tan tan tan 1tan tan . 即0)(tan tan )1tan (222=-+-?b a x a b 恒成立.

即????==??????=-=-?11

tan 0

tan 01tan 2

2

2b a b a a b Z k b k a ∈????

?

=,1

4ππ, 当Z m m x ∈+

=,2

π

π,4

π

π±

=k a 时,tan(a-x)tan(a+x)=cot 2

(a)=1.

因此满足x x f tan )(3=是一个“S-函数”的常数(a , b )=Z k k ∈±

),1,4

π.…9分

(3)函数)(x f 是“S-函数”,且存在满足条件的有序实数对)1,0(和)4,1(, 于是,4)1()1(,1)()(=-?+=-?x f x f x f x f

即]1,0[2]2,1[,4)2()(4)1()1(∈-∈=-?=-?+x x x f x f x f x f 时,, ]4,2[)

2(4

)(∈-=

x f x f ,]4,1[)(]2,0[∈∈∴x f x 时,.

)(4)2()2(4)()(1)(4)1()1(1)()(x f x f x f x f x f x f x f x f x f x f =+????

?

???

+=

-=-????=-?+=-?.

].

2,2[)(,

]2012,2010[],

2,2[)(,

]22,2[],

2,16[)(,

]6,4[],16,4[)(]4,2[201220102226∈∈∈+∈∈∈∈∈+x f x x f k k x x f x x f x k k 时时依次类推可知时时,

因此]2,1[)(]2012

,0[2012

∈∈x f x 时,,

].1,2[)(]2,1[)(],2012,0[,)

(1

)(,]0,2012

[20122012-∈?∈-∈--=-∈x f x f x x f x f x 时 综上可知当]2012,2012

[-∈x 时函数)(x f 的值域为]2[22012-2012

,.

2019-2020年高一下学期数学周练卷(15)

2019-2020年高一下学期数学周练卷(15) 一`、选择题: (每小题5分,共60分) 1. 算法的三种基本结构是 ( ) A. 顺序结构、模块结构、条件结构 B. 顺序结构、循环结构、模块结构 C. 顺序结构、条件结构、循环结构 D. 模块结构、条件结构、循环结构 2. 将两个数a=8,b=17交换,使a=17,b=8,下面语句正确一组是 ( ) A. B. C. D. 3. 下面为一个求20个数的平均数的程序,在横线上应填充的语句为 ( ) A. i>20 B. i<20 C. i>=20 D. i<=20 4. 下列各数中最小的数是 ( ) A.)9(85 B.)6(210 C.)4(1000 D. )2(111111 5. 用秦九韶算法计算多项式6 54323567983512)(x x x x x x x f ++++-+=在4 -=x 时的值时,3V 的值为 ( ) A. -845 B. 220 C. -57 D. 34 6、1337与382的最大公约数是 ( ) A.3 B.382 C.191 D.201 7、计算机中常用16进制,采用数字0~9和字母A ~F 共16个 计数符号与10进制得对应关系如下表: 16进制 0 1 2 3 4 5 6 7 8 9 A B C D E F 10进制 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 那么,16进制中的16C 化为十进制数应为 ( ) A 1612 B 364 C 5660 D 360 8.有20位同学,编号从1至20,现在从中抽取4人作问卷调查,用系统抽样方法确定所抽的编号为( ) A.5,10,15,20 B.2,6,10,14 C.2,4,6,8 D.5,8,11,14 9.某公司在甲、乙、丙、丁四个地区分别有150个、120个、180个、150个销售点,公司 a=b b=a c=b b=a a=c b=a a=b a=c c=b b=a S=0 i=1 DO INPUT x S=S+x i=i+1 LOOP UNTIL _____ a=S/20 PRINT a END

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He stopped the taxi driver, knocked him down, and threw him out of the __47__. At the same time, Miss Green take out of a knife and __48_ it at Kate. She asked Kate to keep _49___. The man then stared the taxi. “Oh, my God! I’m being kidnapped, ”Kate said to herself. She tried to escape, but not _50__. Suddenly an _51__ came to her. She took out a lipstick(口红)from her pocket, wrote “SOS” on the window, and covered the word with her __52_. A few minutes later, a police car __53__ and the policeman saw the sign. When the kidnappers saw the policeman they stopped the taxi, jumped into the grass, and ran away. The policeman then _54__ Kate up and sent her home. When her parents knew what had happened, they were greatly surprised. But they were also __55__ because their daughter had finally came back hone safely. ( ) 41. A. school B. taxi C. shop D. friend’s ( ) 42. A. knew B. believed C. thanked D .remembered ( ) 43. A. told B .asked C. wondered D. checked ( ) 44. A. sure B. excited C. surprised D. pleased ( ) 45. A .How B .Where C .When D.Why ( ) 46. A. drove B.climbed C.fell D.appeared ( ) 47. A .road B.sight C.taxi D .home ( ) 48. A. shouted B . played C . hurt D. pointed ( ) 49. A .healthy B. alive C .relaxed D .quiet ( ) 50. A. happened B .failed C. succeeded D. hurried ( ) 51. A .idea B .answer C. interest D .order ( ) 52. A. feet B .back C. dress D .lipstick ( ) 53. A .stopped B .left C .passed D. turned ( ) 54. A .lifted B. cleaned C .put D .picked ( ) 55. A .worried B .happy C. proud D. successful 四.阅读理解。(15×2) A Three Things to Do Before You Are 18 Are you bored with your daily life? Here are some things you should try before you are 18, because after that it’s too late. Learn to swim Seriously, this is so important that it can save your life. If you can’t swim well, you won’t be able to do water sports like waterskiing, surf ing and diving. Even taking a boat trip will be dangerous for you. Make sure you do it. Try at least one kind of team sports Being a good team player is an important skill in life. You can’t just think of yourself, but have to work well with other people. Other advantages of team sports like basketball, football and baseball are that they keep you fit and healthy, and they are so great fun. Teams usually have a good social life too---you will go to lots of parties and make many friends. Collect something One of the best hobbies for under ---18s is collecting things. You can collect some kinds of stamps, or you can collect things that make you remember what you have done, like cinema tickets for films you have seen or e-mails from friends. The best way to collect is to have a special album(集物簿册)to put your collection in and to write what each thing means to you. That way you won’t forget. ( ) 56. The writer advises us to try the things before ____ years old. A. 16 B. 17 C.18 D. 19 ( ) 57. How many kinds of water sports are mentioned in the passage except swimming? A. Two B. Three C. Four D. Five ( ) 58. Which is NOT the advantage of team sports? A. To save your life B. To keep fit C. To make you happy D. To think of others ( ) 59. Which of the skills is the most important according to the writer in the first paragraph? A. swimming B. Team sports C. Collecting D. Running ( ) 60. Who is this passage written to? A. The old B. Woman C. Adults D. The teenagers B Living healthily isn’t just about a strong and healthy body. It’s also about feeling good every day. It’s not hard to have a healthy lifestyle. Having a good diet is an important part of a healthy lifestyle. Make sure you have vegetables and fruit every day. Avoid junk food. They have trans fats(反式脂肪)that can also be found in biscuits and cakes. Eating too much can lead to heart diseases. Getting outdoors and being close to nature is also key. You can go for a walk, a hike or a bike ride. It is not only a great way to enjoy the beauty of the wild, but it also helps you get ride of stress and anxiety. Don’t spend much time chatting on line or playing video games. You may thi nk it is a way to relax. But researchers at the University Of Gothenburg in Sweden point can develop stress and sleeping disorders. Children should limit their time in front of a screen to one or two hours per day, according to Reuters. Creating a healthy lifestyle doesn’t mean quick changes. Making small changes in how you live each day can lead to big rewards. So find out how to be healthy today. ( ) 61. Having a healthy diet includes the following EXCEPT ____ A. eating less trans fats B. avoiding eating too much C. having vegetables every day D. eating more biscuits and cakes ( ) 62. Being close to nature can _____ A. stop you from getting ill B. help you reduce pressure C. help you study better D. make you interested in animals ( ) 63. From paragraph 4, we can learn that____ A.limiting online time is the best way to keep healthy

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