名校
1 . 条件概率只是缩小了样本空间,因此条件概率同样具有概率的性质.故试着证明条件概率的性质(1)和(2).设
,则
(1)
;
(2)如果B和C是两个互斥事件,则
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50c816169580d6ffc7292fd51a04fdc4.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a1368f4ae980b4fd0f3082c9624cfc.png)
(2)如果B和C是两个互斥事件,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eee181bdfbca5efd2164e312030be6ee.png)
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2 . 椭圆曲线加密算法运用于区块链.
椭圆曲线
.
关于x轴的对称点记为
.C在点
处的切线是指曲线
在点P处的切线.定义“
”运算满足:①若
,且直线PQ与C有第三个交点R,则
;②若
,且PQ为C的切线,切点为P,则
;③若
,规定
,且
.
(1)当
时,讨论函数
零点的个数;
(2)已知“
”运算满足交换律、结合律,若
,且PQ为C的切线,切点为P,证明:
;
(3)已知
,且直线PQ与C有第三个交点,求
的坐标.
参考公式:
椭圆曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9656273cea815e9c38f5b423a786df95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3b61b75052082d32b4f395ec629d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff3a05fcf57fccf4289fadb439a155f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02ec372ff211f6b93ad213f67eed57b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ace8e8a2a533a8c62386aaad29fcba06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c3c2f679d53b91088ba6eb14c16cbc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0ee254499b8d5f8a09dead12204492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5473b8307312b1275ae3e206114349a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0ee254499b8d5f8a09dead12204492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ad8402e9295f4a4cde8b1a508152798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee3b61b75052082d32b4f395ec629d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70780e53aab31d009faeaf1c8a3564a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7efe1b189db965f857c27c88414715e.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f93a7d10e5e86606daa686fb5cb950d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc232553cfd6222d857896bfd5a7750.png)
(2)已知“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c3c2f679d53b91088ba6eb14c16cbc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0ee254499b8d5f8a09dead12204492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9849a648fcdeb7aefe903aaf852977b0.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d3522a66a525ab0d7ff4d3fa6b2cfa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683260f27f7fb8f91c1782153621806f.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdfaadcff67f1ac61b3e3b2b3cacbf32.png)
您最近一年使用:0次
2023-02-23更新
|
5352次组卷
|
15卷引用:山西省大同市2023届高三阶段性模拟(2月联考)数学试题(A卷)
山西省大同市2023届高三阶段性模拟(2月联考)数学试题(A卷)山西省大同市第一中学校等2校2023届高三一模理科数学试题2023届安徽省、云南省、吉林省、黑龙江省高三下学期2月适应性测试数学试题2023年安徽省、云南省、吉林省、黑龙江省联考数学试卷评价(已下线)2023年四省联考变试题17-22云南省2023届高三第一次高中毕业生复习统一检测数学试题北京市第五十七中学2022-2023学年高二下学期3月月考数学试题(已下线)专题19新文化与创新试题(已下线)专题05导数及其应用(解答题)(已下线)江西省九师联盟2024届高三上学期10月联考数学试题(已下线)专题15 圆锥曲线综合(已下线)函数的图象与性质(已下线)新题型01 新高考新结构二十一大考点汇总-3(已下线)专题22 新高考新题型第19题新定义压轴解答题归纳(9大题型)(练习)(已下线)专题8 考前押题大猜想36-40
名校
3 . 已知中心为坐标原点,焦点在坐标轴上的椭圆
经过点
,
.
(1)求
的方程;
(2)已知点
,直线
与
交于
两点,且直线
的斜率之和为
,证明:点
在一条定抛物线上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f94718313450e8a66d1fd47728891375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c59b8c8470f9eb1d2686f5287991b59.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b671cdde6baf9ab577330696ca8ff121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4d9dc481eb068489c6fb35d47aadac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342ba1917a6b854ad111a3e6f5514934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808426112792e9a80a06f611b60827a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5445b4183917494ad8aa1731073dd1d5.png)
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2022-12-20更新
|
697次组卷
|
5卷引用:山西省部分学校2023届高三上学期12月联考数学试题
解题方法
4 . 设函数
,且
.
(1)求
的取值范围;
(2)若
,且
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef8a3b9e57e3e5266d5c6e2abf3b7dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f730cbbb88355e0f2b8ba350ab6b1af1.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba934874cc9f2ab272fdff67ea23bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d7d6e1124df72c7c1e86fcb466704c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c8c68cf8575f884b9db2603d23a02e.png)
您最近一年使用:0次
解题方法
5 . 已知抛物线
的焦点为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/9c3a29c6-c76c-45ba-b61c-be95080b7958.png?resizew=167)
(1)如图所示,线段
为过点
且与
轴垂直的弦,动点
在线段
上,过点
且斜率为1的直线
与抛物线交于
两点,请问
是否为定值,若是,求出该定值;若不是,说明理由;
(2)过焦点
作直线
与
交于
两点,分别过
作抛物线
的切线,已知两切线交于点
,求证:直线
、
、
的斜率成等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/11/9c3a29c6-c76c-45ba-b61c-be95080b7958.png?resizew=167)
(1)如图所示,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8141a4a565a9b1e56bf710b84476a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d6e75677951ef1388f76aee5a779149.png)
(2)过焦点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34517f479fb08f6096d2fb0362f3ad0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95add8635f609e7fdc0a423842f7d037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95add8635f609e7fdc0a423842f7d037.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e1ab8833d1823f3dc027a39bdb58e9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1a6ce0b35896c8a1c687a4376e71f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a75af77f184b8d76a881874298852081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4ad3d1bc78e0ea7a5518f38c0cf5b30.png)
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2023-01-10更新
|
1213次组卷
|
4卷引用:山西省吕梁市2023届高三上学期期末数学试题
山西省吕梁市2023届高三上学期期末数学试题山西省运城市2022-2023学年高三上学期期末调研测试数学试题(已下线)专题3 解答题题型(已下线)安徽省江南十校2022届高三下学期3月一模理科数学试题变式题16-20
6 . 某中学为了调查学生每周运动时长,随机从全校男生和女生中各抽取了90名学生进行问卷调查,并对每周不同运动时长所对应的人数进行了统计,得到如下数据:
(1)能否有99%的把握认为男生与女生每周平均运动时长有差异?
(2)现随机从全校男生和女生中各随机抽取2名学生,记其中男生和女生中每周平均运动时长不少于7小时的人数分别为X,Y,且记
,证明:
.
附:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
每周平均运动时长少于7小时 | 每周平均运动时长不少于7小时 | |
男生 | 45 | 45 |
女生 | 60 | 30 |
(2)现随机从全校男生和女生中各随机抽取2名学生,记其中男生和女生中每周平均运动时长不少于7小时的人数分别为X,Y,且记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d2c899c53fe02395fec2980c7feedc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8457bdb81701c42c0b95afae94e326c.png)
附:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
0.050 | 0.010 | 0.001 | |
3.841 | 6.635 | 10.828 |
您最近一年使用:0次
名校
解题方法
7 . 已知抛物线
上一动点G,过点G作x轴的垂线,垂足为D,M是
上一点,且满足
.
(1)求动点M的轨迹C;
(2)若
为曲线C上一定点,过点P作两条直线分别与抛物线交于A,B两点,若满足
,求证:直线
恒过定点,并求出定点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ca3b0aa32a947786e56e03358ed019d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5c8f133f8a3560ff5a14137411740f2.png)
(1)求动点M的轨迹C;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4be3a55efb9e423e27ca1e6a43881788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce68b1c5f9158699c13bb406a5f20a7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
2022-11-29更新
|
755次组卷
|
3卷引用:山西省高中教育发展联盟2022-2023学年高二上学期11月期中检测数学试题
山西省高中教育发展联盟2022-2023学年高二上学期11月期中检测数学试题辽宁省锦州市渤海大学附属高级中学2022-2023学年高二上学期期末数学试题(已下线)专题05 抛物线8种常见考法归类(2)
解题方法
8 . 在现实生活中,每个人都有一定的心理压力,而且这种压力将伴随着现代生活节奏的加快和社会竞争日趋加速而逐渐增大,心理压力产生的主要原因是个人目标期望值与现实状况之间的差距,这种差距越大产生的心理压力就越大,当心理压力达到一定程度时,不但不会产生积极的动力,反而会使人的身体经络系统失去平衡,进而产生如焦虑症、恐慌症、失眠症等其他心理疾病,某市为了解市民压力情况,随机对该市的1000位市民进行了心理压力测试,并对他们的测试分数进行统计,得到如图所示的频率分布直方图.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/a819c85a-d12e-41d0-b6ed-5b62173a83f7.png?resizew=268)
(1)测试分数越接近100表示压力越大,80分为临界分数,测试分数不低于临界分数的则需要降低追求目标或充分休息,以样本的频率作为总体的概率,在该市随机调查10位市民,X表示其中需要降低追求目标或充分休息的人数,求X的期望;
(2)从样本中测试分数在
的两组市民中,用样本量比例分配的分层随机抽样的方法抽取10人,再从这10人中随机选出3人,求选出的3人中恰有2人测试分数在
中的概率;
(3)若一个总体划分为两层,通过分层随机抽样,各层抽取的样本量,样本平均数和样本方差分别为:m,
,
,n,
,
.记总的样本平均数为
,样本方差为
.证明:①
;②
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/21/a819c85a-d12e-41d0-b6ed-5b62173a83f7.png?resizew=268)
(1)测试分数越接近100表示压力越大,80分为临界分数,测试分数不低于临界分数的则需要降低追求目标或充分休息,以样本的频率作为总体的概率,在该市随机调查10位市民,X表示其中需要降低追求目标或充分休息的人数,求X的期望;
(2)从样本中测试分数在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc920f1c050735f5108ab1aaf866367e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/328fcb58a789bd05648864910ede4d36.png)
(3)若一个总体划分为两层,通过分层随机抽样,各层抽取的样本量,样本平均数和样本方差分别为:m,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbe7f95b5d89f9409ec24536da9e826.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbc29b47b83fdc5368770b7b1acb439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb525270c748eddaaecc4a549cca250e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1295cbd36fdc55a55b549aa2dd5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02931526ba46098639424f341794bd45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671f43c79d612c93a6d160335e86e177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978ecc127311275ef815333bbdaa6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91b2c40ed119866fbea44e53afc67e2f.png)
您最近一年使用:0次
9 . 已知函数
(
),
(
).
(1)讨论函数
的单调性;
(2)当
时,函数
、
满足下面两个条件:①方程
有唯一实数解
;②直线
(
)与两条曲线
和
有四个不同的交点,从左到右依次为
,
,
,
.问是否存在1,2,3,4的一个排列
,
,
,
,使得
?如果存在,请给出证明;如果不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c73cf0d3363268899ede79d3058c1c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c98bf9d630346ad3447fe360c2534b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
(1)讨论函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9587df831df1af5e7dd6be5fdc7bd8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/155c7f573e898da225390202da1767e7.png)
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4卷引用:山西省阳高县第一中学校2022-2023学年高二下学期期末数学试题
山西省阳高县第一中学校2022-2023学年高二下学期期末数学试题山东省菏泽市2021-2022学年高二下学期期末数学试题(已下线)专题10 导数及其应用难点突破2-利用导数解决零点、交点问题-2(已下线)模块三 专题1 劣构题专练【高二下人教B版】
名校
解题方法
10 . 已知椭圆
:
,设过点
的直线
交椭圆
于
,
两点,交直线
于点
,点
为直线
上不同于点A的任意一点.
,求
的取值范围;
(2)若
,记直线
,
,
的斜率分别为
,
,
,问是否存在
,
,
的某种排列
,
,
(其中
,使得
,
,
成等差数列或等比数列?若存在,写出结论,并加以证明;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40c1fb9f8b59508b1b58180c899d1787.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f23d29646155e27b172ecdf263e2d702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c93d5f956a50f96f2b257a61bcd1db09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf434334b09cc0fdd4e86e84e6ceb00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf434334b09cc0fdd4e86e84e6ceb00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cc03cd251a03b73ebae3ea1d6bca76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2eb8885dc1f43959efc27d89291c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b84ad6ffc62173c68ff3ca5cf19f14b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5cfbf857a2ac07cbdada127302a3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8cc03cd251a03b73ebae3ea1d6bca76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2eb8885dc1f43959efc27d89291c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b84ad6ffc62173c68ff3ca5cf19f14b9.png)
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2023-03-18更新
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4卷引用:山西省2023届高三适应性考试数学试题