如图,在
中,
,
,
,
是
的中点,点
满足
,
与
交于点
.则
的余弦值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d5824d60b9d08f93d0904380c775d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68c6ee5e9d1b0396d2a6b1393be4167d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/3c8ee981-d979-4d85-928c-110e48926d64.png?resizew=209)
更新时间:2021-07-25 22:11:44
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填空题-双空题
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适中
(0.65)
【推荐1】已知
外接圆的半径为1,圆心为点
,且满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f02d3d9795d94b208d6fd7e489b5353b.png)
__________ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372fdfbc3f3cc594a81469ea8785ad0.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f75230415c1ccb873d38242cc4fadd.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f02d3d9795d94b208d6fd7e489b5353b.png)
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解题方法
【推荐2】如图,在平行四边形
中,
,
,E为边
的中点,
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bd94d9dc7cdc2ce797ba8c171d3387f.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】已知圆
过点
,
,且点
关于直线
的对称点
仍在圆
上,则圆
的标准方程为__________ ;设
是圆
上任意一点,
,
,
,则
的最小值为_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bacfc149ede71417fa599c21b5a84cb8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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填空题-单空题
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【推荐2】两条直线2x+3y-k=0和x-ky+12=0的交点在y轴上,那么k的值是
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