名校
解题方法
1 . 若
,
,则
的值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc93326b8dcc81601e084c2f60981513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8285ecf0648f6dccc0ab3bfd23642290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eca80d80b6e1577762585b69145736b.png)
您最近一年使用:0次
2022-06-22更新
|
702次组卷
|
2卷引用:2022年全国高中数学联赛江苏赛区苏州市选拔赛试题
解题方法
2 . 空间四面体ABCD中,已知
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/665746bf-ebef-4fac-b425-6dbef3721475.png?resizew=161)
(1)求CD的长;
(2)已知点E在线段AC上运动,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b134e7a79f6b0ccd857d2ed852098e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa6874ed1ac4e8ebf7f341e3e3056cfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b36f544cf07db2aeecbe76e87a8c555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/20/665746bf-ebef-4fac-b425-6dbef3721475.png?resizew=161)
(1)求CD的长;
(2)已知点E在线段AC上运动,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ae7c0b22a09146fe87955159f70454b.png)
您最近一年使用:0次
解题方法
3 . ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7fb476bdfddd8bd1ece52e71a26bc8.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7fb476bdfddd8bd1ece52e71a26bc8.png)
您最近一年使用:0次
2021-07-10更新
|
604次组卷
|
3卷引用:2021年全国高中数学联赛浙江赛区预赛试题
4 .
中,角A、B、C所对的边分别为
、
、
,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880c92a0e1f8a4dcad0728084727a1de.png)
(1)求
的值; (2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880c92a0e1f8a4dcad0728084727a1de.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03005d17bf564371ad29fea41f5c650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次