如图在同一平面内,向量
,
,
的模分别为1,2,3,且
与
的夹角为
,且
,
与
的夹角为
,若
(
),则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d60dcb171bb7fd972aab8294d63acdb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9a7de5b70003502e40b95b3b7d3d933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f68628a408537b1cf3bf1ca2a69731b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20ec3efaa6b6ff5769e8999df5714a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccfd81d120348601cd611241d1a5dc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd76f0083ba8338b2c3f5c471048c75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e68a83b4093280ea8750677f6828bf47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/2/7588cb4a-0753-477d-8acd-bfdd73f4fae2.png?resizew=172)
更新时间:2021-08-31 21:41:49
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适中
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【推荐1】如图,在菱形
中,
,
,
、
分别为
、
上的点,
,
,若线段
上存在一点
,使得
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267e1fca278ad073e7a67642ababf077.png)
____ ;若
,则
的最大值为 _____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7acd69f9a7b4f4b7176eba8a2388631c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35c0f3e6987b64c46a9fddbf1588510b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5eb064f478d74e6a2af2553206f875b.png)
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【推荐2】共和国勋章,是中华人民共和国最高荣誉勋章,授予在中国特色社会主义建设和保卫国家中作出巨大贡献、建立卓越功勋的杰出人士.2020年8月11日,国家主席习近平签署主席令,授予钟南山“共和国勋章”.某市为表彰在抗疫中表现突出的个人,制作的荣誉勋章的挂坠结构示意图如图,O为图中两个同心圆的圆心,三角形ABC中,AB=AC,大圆半径OA=2,小圆半径OB=OC=1,记S为三角形OAB与三角形OAC的面积之和,其中
,
,则S的最大值为______ ,此时![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/007a63c2303f33e3dab20d49e846d4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597a3d2f88e3d391fc4e9a5131c290ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
![](https://img.xkw.com/dksih/QBM/2022/7/20/3026587167899648/3027144439898112/STEM/cd49b4ca962349c5972726929c790eea.png?resizew=160)
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解题方法
【推荐1】已知菱形
的边长为
,且
,将菱形沿对角线
翻折成直二面角
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105ec23be7d6a51641b0d2c4aace9bee.png)
__________ ;二面角
的余弦值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aedf65d7d930fdb972d4802c0dea8b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c909cd1b6f3fa1ec39eb245e8f5c11c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105ec23be7d6a51641b0d2c4aace9bee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f1854ba6cc92481d7a616bd2788a47e.png)
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解题方法
【推荐2】
中,
,
,
是
外接圆的圆心,则
的最大值为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c1671bb42b77ca467df0002940f5a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15167b49aad18e17a3b4e58ad6b61c13.png)
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【推荐1】设
,
,
是任意非零的平面向量,且互不共线,给出以下命题:
①
;
②
不与向量
垂直;
③
.
其中是真命题的是_________ .(填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a801d21dab86af22e289081213703fc.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f518c8da9e3070890b3b2c3eee9c81ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf1e5f35f2f018c7a0c98bbd7f4630ea.png)
其中是真命题的是
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【推荐2】如图,在
中,
,
,
,
分别为
,
的中点,
为
与
的交点,且
.若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
___________ ;若
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/979fe4251a15b870fc6416b2fcd86676.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e7a93a1399ff7a2bde342652479241b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae92f0c583cc9daf980a8621ad96aef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/979fe4251a15b870fc6416b2fcd86676.png)
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