已知正三角形ABC的边长为2
,圆O是该三角形的内切圆,P是圆O上的任意一点,则
的最大值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a33e5d0dbdd0f15854f0d7dd8b53058.png)
2018高三·江苏·专题练习 查看更多[2]
更新时间:2018-04-23 16:24:42
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【推荐1】在
中,点
满足
,
若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5907a6738bc17ec6d2be154a3b8494.png)
_________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7735eeeba8e3fe00e3fb401ffe449ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c1afa7d5300b8b1013140fa32436d58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3db96565a56385c77782c9963c0960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5907a6738bc17ec6d2be154a3b8494.png)
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【推荐2】关于平面向量有下列四个命题:
①若
,则
;
②已知
,
.若
,则
.
③非零向量
和
,满足
,则
与
的夹角为
.
④
.
其中正确的命题为________ .(写出所有正确命题的序号)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7640198689368a1bcf68bd6dac5e0c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99a90f1e7b09ade6210e2ded8598827a.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbed8999d052c3e6a60f489e70348b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d50663648708ecadf871ea2d1dd34f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d76ee2e81f447f84a3e0b39c0388ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b02f266bd253738e315e84231235f0d2.png)
③非零向量
![](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/ae71a073f2c2fc724a43add0cbca33d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9cd8bbf47b69bbd7a6263b041290d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/213855b84d8c9f4121199f953fc69305.png)
其中正确的命题为
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解题方法
【推荐1】在锐角
中,
,若点
为
的外心,且
,则实数
的值为___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9de323d0d2b99eda4fc5650b1973573.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/a733a9502c4bd6d1f0cd08e078a225e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解题方法
【推荐2】已知向量
,
的夹角为
,
,
,且对任意的
,
的最小值是
,则
的大小为________ .
![](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/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3f8682540cd84c62e6fa835cd02f42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e16d81d266f24698696a81ed5e007680.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380cca64859b15c565b5b65c49438c5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a35d9cd838b076c6c0f7d41899a38b6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/860884c0017c8bceb5b0edff796c144f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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