已知
的三边长为
,
,
,若满足
,则角
大小为______ .
![](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/6e58ff373a852c9c3e3a00d21483362e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
更新时间:2021-08-04 14:05:47
|
相似题推荐
填空题-单空题
|
较易
(0.85)
名校
【推荐1】如图,已知
是椭圆
的焦点,M,N为椭圆上两点,满足
,且
,则
的余弦值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81fd1de60131851dc753d672bd90947d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4dcd928b934b9bece83513cf598e0c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad962dbc7f27aef70ef5353566963a38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e22a3c7e465a61e9849dd223261be47c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/63eac612-fd5a-4403-9b7d-3a9d32014e3a.png?resizew=203)
您最近一年使用:0次
填空题-单空题
|
较易
(0.85)
【推荐2】若长方体
的8个顶点都在球
的球面上,
,球
的表面积为
,则直线
与直线
所成角的余弦值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a119d8868853c12e9d2b1c0b116fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
您最近一年使用:0次