您所在的当前位置：高中数学试题 >

函数y=Asin(ωx+φ)的图象

> 若y=cosx的图象上各点纵坐标不变，横坐标变为原来的 1 2 倍，然后把图象沿x轴向左平移 π 4 单位，则所得图象的函数解析式为（　　） A．y=sin2x B．y=cos(2x+ π 2 ) C．y=cos(2x+ π 4 ) D．y=cos( x 2 + π 4 )

问题：

发布时间：2024-09-10

若y=cosx的图象上各点纵坐标不变，横坐标变为原来的

1

2

倍，然后把图象沿x轴向左平移

π

4

单位，则所得图象的函数解析式为（　　）

A．y=sin2x B．y=cos(2x+

π

2

) C．y=cos(2x+

π

4

) D．y=cos(

x

2

+

π

4

)

参考答案：

提问用户：9H***CgK

可能感兴趣的题目：

1 下列物质中，可用于鉴别盐酸与硫酸溶液的试剂是（　　） A．紫色石蕊试液 B．碳酸钠溶液 C．硝酸银溶液 D．氢氧化钡溶液
2 下列四个命题中，假命题为 [ ] A.任意，使 B.任意，使 C.存在，使 D.存在，使
3 某同学向盛有少量碳酸钠溶液的烧杯中滴入氯化钙溶液，立即产生白色沉淀，过滤后得到澄清滤液，你认为滤液中含有哪些溶质？请你猜想，并设计实验来验证． [猜想]：猜想①：滤液中的溶质有______；猜想②：滤液中的溶质有______；猜想③：滤液中只有______． [设计实验]：请你设计实验方案来验证以上猜想，并将有关内容填写在以下实验报告的空格内．实验步骤实验现象及有关化学方程式结论 ______ ______ 猜想①正确 ______ ______ 猜想②正确 ______ ______ 猜想③正确
4 名句名篇默写（6分） ⑴敏而好学， ⑵桃李不言 ⑶出师未捷身先死， ⑷身无彩风双飞翼， ⑸细草微风岸， ⑹戎马关山北，。
5 You won’t feel happy at school ____ you get on well with your classmates. A．though B．when C．unless D．because
6 ____________写的《____________》既是一部优秀的地理学著作，又是具有很高的文学和史学价值。
7 重50N的物体，在粗糙水平面上向右运动，物体和水平面间的动摩擦因数为μ=0.2，同时物体还受到一个大小为10N、方向水平向左的水平拉力F作用，如图所示，则平面对物体的摩擦力的大小和方向是（　　） A．10N，水平向左 B．20N，水平向左 C．10N，水平向右 D．20N，水平向右
8 阅读理解。 Long long ago, human beings used to walk barefoot. A king happened to travel 1 into the countryside. He was greatly troubled by the 2 roads where gravel (砾石) and broken stones pricked (使刺痛) and numbed (使麻木) his 3 . When he returned to his palace he issued an order that all the roads be 4 with cattle hide (牛皮). He thought it was beneficial not only to 5 but also to his people and hoped 6 would no longer be a painful thing But 7 all the cattle in the kingdom were killed there 8 not be enough hide to get the work done. Evidently it was a stupid 9 . As it was an imperial order people could do nothing but shake their heads and 10 . At this juncture a clever servant in the palace 11 to make a suggestion. "Your Majesty, why don"t take an easier way? You don"t have to mobilize (调动) so many people, to have so many oxen killed, nor so much money 12 . What you have to do is simply to cover each of your feet with a piece of hide." Surprised and 13 , the king immediately changed his mind and adopted the 14 . This is said to be the origin of using 15 to make shoes. Though it sounds 16 and strange, it inspires us to think. It is much easier to change oneself than to change the world. 17 it will be much better for one to change oneself before one 18 an attempt to change the outer world. Why don"t try to put yourself on the 19 of the person you deal with? You will find it easier to solve a problem 20 you change your way of thinking. ( )1. A. much ( )2. A. smooth ( )3. A. body ( )4. A. crowded ( )5. A. others ( )6. A. walking ( )7. A. as well ( )8. A. would ( )9. A. comment ( )10. A. sigh ( )11. A. wanted ( )12. A. wasted ( )13. A. moved ( )14. A. decision ( )15. A. leather ( )16. A. odd ( )17. A. Or ( )18. A. makes ( )19. A. direction ( )20. A. before B. near B. rough B. arms B. filled B. himself B. swimming B. even if B. should B. chance B. sign B. ventured B. borrowed B. excited B. plan B. silk B. funny B. But B. tries B. situation B. if C. far C. long C. feet C. covered C. them C. singing C. as long as C. must C. attempt C. cheer C. planned C. saved C. pleased C. suggestion C. plastic C. amusing C. So C. takes C. occasion C. while D. a lot D. busy D. legs D. put D. themselves D. shopping D. when D. may D. opinion D. weep D. hoped D. loaned D. bored D. measure D. cloth D. surprising D. However D. gives D. position D. until
9 下图是某生态系统中食物网简图，图中甲至庚分别代表不同的生物．请根据图分析回答：（1）此生态系统中生物数量最多的是______．此生态系统各种生物生命活动所需的能量最终来源于______．（2）此生态系统中作为生产者的是______，甲生物和巳生物的关系是______．（3）此生态系统中共有______条食物链．（4）若此生态系统遭到重金属污染，体内积存重金属污染物最多的生物是______．
10 Monica promised to forgive Jason _______ he showed his actual deeds. A．as if B．in case C．except that D．on condition that

若y=cosx的图象上各点纵坐标不变，横坐标变为原来的 1 2 倍，然后把图象沿x轴向左平移 π 4 单位，则所得图象的函数解析式为（ ） A．y=sin2x B．y=cos(2x+ π 2 ) C．y=cos(2x+ π 4 ) D．y=cos( x 2 + π 4 )

可能感兴趣的题目：

若y=cosx的图象上各点纵坐标不变，横坐标变为原来的

1

2

倍，然后把图象沿x轴向左平移

π

4

单位，则所得图象的函数解析式为（　　）

A．y=sin2x B．y=cos(2x+

π

2

) C．y=cos(2x+

π

4

) D．y=cos(

x

2

+

π

4

)