名校
1 . 人脸识别中检测样本之间相似度主要应用距离的测试,常用测量距离的方式有曼哈顿距离和余弦距离.若二维空间有两个点
,
,则曼哈顿距离为:
,余弦相似度为:
,余弦距离为
.若
,
,则A,B之间的余弦距离为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c663466d641b5fdfef1e529d6c330ecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/166afeb61d5a80366a8ae29c912cd644.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d984a4a83c5dd3aa7f8c09f14b97f39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82134044305e4732cb3672d332536d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9dd59dc70150f926150164668bbc6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629647152cb83bddff554480a6b48f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fe29d2ea51fba58ce0b52011f5f3642.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
2 . 如图,在
中,
,
,
,P是
内的一点.
(1)若P是等腰直角三角形PBC的直角顶点,求PA的长;
(2)若
,设
,求
的面积
的解析式,并求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269c684310d0f7b5b9bf0a291e7ee748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/c998e8f9-23d5-490b-8296-eb1356e057f8.png?resizew=145)
(1)若P是等腰直角三角形PBC的直角顶点,求PA的长;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00e21133e374201d1400b3c8aac58471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b354a9ef012fc44e3c70f483f399c9f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24d51da288cc4b81c7797fc643b1ace9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24d51da288cc4b81c7797fc643b1ace9.png)
您最近一年使用:0次
2017-10-13更新
|
700次组卷
|
4卷引用:重庆市南开中学2023-2024学年高一下学期阶段测试数学试题(3月31日)