名校
解题方法
1 . 设正n边形的边长为1,顶点依次为
,若存在点P满足
,且
,则n的最大值为__________ .(参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/252bab154aa5bdc9b4bce4c0d43aaf73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/470c98bbdfd975f85036bdd48e59d92e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e071a13edd9a57280b7aeeeac704dfdf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56606e332e4578c9435fcccb4067260.png)
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2 . 集合
,其中
为单位向量,两两之间夹角为120°.现从A中任选一个向量,选取n次,并将所选取的向量合成为一个向量,则最终得到的不同向量有______ 个(用含n的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e82e3cccc863a7ca7de93f5ca796fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0aca31150d49fff8a60dc4d5df88a7.png)
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解题方法
3 . 设正八边形
的外接圆半径为
,圆心是点
,点
在边
上,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8ec54efd8b9ee06bc283b48f53fff1.png)
____________ ;若
在线段
上,且
,则
的取值范围为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7b4f891e309c6e73b889b18f5daa102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473913c0887bb64d386f4c02f1853452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8ec54efd8b9ee06bc283b48f53fff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473913c0887bb64d386f4c02f1853452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/341f994255e5781272b12e631657d39c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d6df06a5b85848dc4fa33327f8e07.png)
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解题方法
4 . 已知
是平行四边形
对角线上的一点,且
,其中
,写出满足条件的
与
的一组
的值__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9545017eee79a71befee621b52c8cae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c88a4bc86ffd96234a9b3a0ca1aab275.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9e4273fd70a87d3e990c464d760b9e5.png)
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解题方法
5 . 已知四边形
,且
,点
为线段
,上一点,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
__________ ,过
作
∥
交
于点
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846299ff167766bf16a9d8f5a086c32f.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66133c8f75e62d05ab0f7a3b17284f31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96da9247812aad714cad99e50868623e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e7c5ffa9bb7f48badb2bf71399dc47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5085e3cdef9ea6c564e079f745d6fdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846299ff167766bf16a9d8f5a086c32f.png)
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名校
解题方法
6 . 等腰直角三角形
(
)的直角边长
,
、
是三角形内的两点,且满足
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/974331902e2c22022993b2b25060f076.png)
__________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635c0e8cd497fd3d766fede583f2e320.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55475c840ad37fa1fd0d707cc7c600c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7ffc6824792fddc8525fa6ecb3f2aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/974331902e2c22022993b2b25060f076.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
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解题方法
7 . 在平面上,已知
为两个不平行的单位向量,O为定点,集合
,若
中所有的点构成图形的面积为1,则
与
夹角的大小为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f9c91af174ebe66c921f52db385a6c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa290b89f748483f9b959b17200a001e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0047f659c182291c84c224df6b5e993f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
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解题方法
8 . 在边长为2的菱形
中,
,E是
的中点,F是边
上的一点,
交
于H.若F是
的中点,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
____________ ;若F在边
上(不含端点)运动,则
的取值范围是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/804dfc12cb95ea0c5ac205c038b19a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96724b211bf3e56d588bd430aa3f2894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97869fd87f334c154207e1080c96d964.png)
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解题方法
9 . 如图,正六边形的边长为2,点
为正六边形的中心,若点
在正六边形的外接圆上运动,点
在半径为1的小圆
上且关于圆心
对称,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61557cca4e2f97defc23aeb18b13f724.png)
__________ ;
的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61557cca4e2f97defc23aeb18b13f724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a10f8bd40e4a7f293185f31d2ef8a0f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/19/79e5b134-8f00-423d-851a-8d297ad6d8e7.png?resizew=136)
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名校
10 . 已知向量
满足
(
为非零的实数),设向量
的夹角为
,有下列四个命题.其中正确的命题有___________ (填写所有正确结论的编号).
①存在
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98c41072ee589f5067938c658884541.png)
②不存在
,使得![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7557713682c09ec526718378189f9f7e.png)
③当
变化时,
的最大值为1
④当
变化时,
的最小值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96022a881e03e32d3483d997c3f170c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7529ee92d5e92360480ca8f87c15fdb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de631112eb0f79150eb75576090848c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
①存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c98c41072ee589f5067938c658884541.png)
②不存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7557713682c09ec526718378189f9f7e.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a282d19bf2c827a98d4443330f7ca1.png)
④当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a282d19bf2c827a98d4443330f7ca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3389f53711264b0acba3ba6019f8b908.png)
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