1 . 将图(1)所示的摩天轮抽象成图(2)所示的平面图形.摩天轮直径为
米,中心
距地面
米,按逆时针方向匀速转动,某游客从最低点
处登上摩天轮,
分钟后第一次到达最高点.
分钟后到达
处,求该游客距离地面的高度;
(2)求该游客距离地面的高度
(单位:米)与他登上摩天轮的时间
(单位:分钟)的函数关系式;
(3)当该游客登上摩天轮
分钟时,他的朋友在摩天轮最低点
处登上摩天轮.求他和他的朋友距离地面的高度之差的绝对值的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b72ac611ae66b86761e080761d9aabc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1834490aacbee800ed5721312f4be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)求该游客距离地面的高度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)当该游客登上摩天轮
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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名校
解题方法
2 . 某年级共200人参加进行物理测试,满分100分,(参考数据:
,
,
)学生的抽测结果
服从正态分布
,其中60分为及格线,80分为良好线,90分为优秀线,则抽测结果在及格线以上学生人数大约为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba13a1c86bb91b2fab6616ea2432474d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de0ccda20243330a347b3886adb79b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e482586d954bf740ff654322168a4c0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e8e3fc375df829368b2127d2b66de0.png)
A.137 | B.168 | C.191 | D.195 |
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3 . 已知数列
,从
中选取第
项、第
项、…、第
项
构成数列
,
称为
的
项子列.记数列
的所有项的和为
.当
时,若
满足:对任意
,
,则称
具有性质
.规定:
的任意一项都是
的
项子列,且具有性质
.
(1)当
时,比较
的具有性质
的子列个数与不具有性质
的子列个数的大小,并说明理由;
(2)已知数列
.
(ⅰ)给定正整数
,对
的
项子列
,求所有
的算术平均值;
(ⅱ)若
有
个不同的具有性质
的子列
,满足:
,
与
都有公共项,且公共项构成
的具有性质
的子列,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/281440c5e428da28c0a40fecbb87a83a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a745b1425e102f3b0b21ee9f0ad3b00c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4104fe7904b991cdb2f081aab13883bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3b8d44073da406348fc6c9dd4ea068.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92f44c615d77249c2714cfb388fec84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c91e6d0611914758f7f0fe01b592f1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e965bb0f1d58c6ae573635f7bb4176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c972cbd63decec197aec1bdc306de67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55507a1da1dfff5cc76e47d62830fa9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a9889f58c052eba0ff037c0ca7b4935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c663bea75eddb0c7f1885079c88b956e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(2)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdea316b1aa1563c8bf3c2b81c09ce69.png)
(ⅰ)给定正整数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f72bc968a860f8ac4d77d51ce93840d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e965bb0f1d58c6ae573635f7bb4176.png)
(ⅱ)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7184704e17e83f3ac39e5fee6b3aa11e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b627bbe576616595035f10bcc0aa8cdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc5c895153932c3e827a464664cef90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a2d8cb9e08ce79015879ea2744e351.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
4 . 如图,正方体
的棱长为2,
分别为
的中点,
为过直线
的平面.从下列结论①,②中选择一个,并判断该结论的真假.你选的结论是______ (填“①”或“②”),该结论是______ 命题(填“真”或“假”).
截该正方体所得截面面积的最大值为
;
②若正方体的12条棱所在直线与平面
所成的角都等于
,则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31be3b7305d6c181420ea7b28c420851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
②若正方体的12条棱所在直线与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea79ca850537f75619fc14abd4940163.png)
您最近一年使用:0次
名校
5 . 从出生之日起,人的智力、情绪、体力呈周期性变化,在前30天内,它们的变化规律如下图所示(均为正弦型曲线):
A.情绪曲线E的最小正周期最大 |
B.存在正整数n,使得第n天时,智力曲线I和体力曲线P都处于最高点 |
C.智力、情绪、体力三条曲线存在无数条公共的对称轴 |
D.智力、情绪、体力三条曲线存在无数个公共的对称中心 |
您最近一年使用:0次
名校
解题方法
6 . 在
中,
.
(1)求
;
(2)除上述条件外,
同时满足____________,求
的值;
请从①
,②
,③
中选择一个符合题意的条件,补充到上面问题中,并完成解答.
(3)求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ae935f403bc9fca71a78ca3c616278.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)除上述条件外,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32e2f2d7147cf1699fbfdef9cf4af74.png)
请从①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4376af85e07b29051a812ff3fcda61a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcdb7a488910743dc5c63afb394b87e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3816ae0180de16f3ef7b01ed2cf9efd4.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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7 . 已知平面内点集
,A中任意两个不同点之间的距离都不相等. 设集合
,
. 给出以下四个结论:
①若
,则
;
②若
为奇数,则
;
③若
为偶数,则
;
④若
,则
.
其中所有正确结论的序号是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/041bc291bff24b4cee0b205da68db1f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ebdde37c672e10fd4ffe741247e566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18faaff0b5622f33a1574103fed13edd.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc2d3df37e73a8abea815f37dbb3fff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdda00159c36552b8a9a9743324f82a0.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffaac03e1e452f075e86853fef2a33de.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdda00159c36552b8a9a9743324f82a0.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25df56dc9b8169cbf924f39bfa9f7c30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acb931a4b3eaa34e2c6f7dab5650f8af.png)
其中所有正确结论的序号是
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解题方法
8 . “用一个不垂直于圆锥的轴的平面截圆锥,当圆锥的轴与截面所成的角不同时,可以得到不同的截口曲线”.利用这个原理,小明在家里用两个射灯(射出的光锥视为圆锥)在墙上投影出两个相同的椭圆(图1),光锥的一条母线恰好与墙面垂直.图2是一个射灯投影的直观图,圆锥
的轴截面
是等边三角形,椭圆
所在平面为
,则椭圆
的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745e0525a41fe2e2a7739c75a942290b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4b27f503ce08bc7851006a98f9ce32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
9 . 在近期学校组织的论文展示大赛中,同学们发现数学在音乐欣赏中起着重要的作用
纯音的数学模型是三角函数
如音叉发出的纯音振动可表示为
,其中
表示时间,
表示纯音振动时音叉的位移
我们听到的每个音是由纯音合成的,若某合音的数学模型为函数
,且声音的质感与
的参数有关,比如:音调与声波的振动频率有关,频率低的声音低沉,频率高的声音尖利.
(1)当
时,函数
的对称中心坐标为______ ;
(2)当
时,合音
的音调比纯音![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a72ab550b89f838b0f71a24c20f4bb.png)
______ (填写“高”或“低”).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42f0670a61f0274e80b47844cea59ac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fe5c8a68ce20e3b6551d9fb67ea85fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87b351f16728b0023fd63678f8103c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b87383da5b68e452263e205594f334.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a72ab550b89f838b0f71a24c20f4bb.png)
您最近一年使用:0次
10 . 已知点集
满足
,
,
.对于任意点集
,若其非空子集A,B满足
,
,则称集合对
为
的一个优划分.对任意点集
及其优划分
,记A中所有点的横坐标之和为
,B中所有点的纵坐标之和为
.
(1)写出
的一个优划分
,使其满足
;
(2)对于任意点集
,求证:存在
的一个优划分
,满足
;
(3)对于任意点集
,求证:存在
的一个优划分
,满足
且
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82ea5bd5d061a16d0ba32daacb6dece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efaead32620574f09623dff495df983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9610877bf323ad7e27b83e886220f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dea9a4259cca10c1f5af28e621ebafd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fc0f5296284e2f6dcba4dbb77b0e141.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95d247ffb2774bb7e22708b25daf7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95d247ffb2774bb7e22708b25daf7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12cb68674b3cdaeda8b7123c747460fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a47112c5ff4179fca6e28aa4d0d47d21.png)
(1)写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16b65432b8fcd588460df55bb8a21f65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95d247ffb2774bb7e22708b25daf7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/673bf8d12ff9956f1fe4b31d32c201fd.png)
(2)对于任意点集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32efe4eff75508cb93e828c735dcb695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32efe4eff75508cb93e828c735dcb695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95d247ffb2774bb7e22708b25daf7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16fd919250fa4a36bc880e8038cbc90b.png)
(3)对于任意点集
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ddad3d9fdb5e9951b6a1c31f9a72a71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95d247ffb2774bb7e22708b25daf7f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/883f136eeb68b72dc768c697ae31e535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9505c141fd8b7c6b4139667bb5853648.png)
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