已知,
,
,
,
,
,边
上一点
,这里
异于
由
引边
的垂线
是垂足,再由
引边
的垂线
是垂足,又由
引边
的垂线
是垂足.同样的操作连续进行,得到点
,
,
设
,如图所示.
(1)某同学对上述已知条件的研究发现如下结论:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0e79293125d5a100dddb396f3ff624.png)
(2)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9297e289a9ef977009186083ec738ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca65005e00cce34bdb94cebcfe8a1984.png)
2024高一下·上海·专题练习 查看更多[1]
(已下线)第八章 平面向量(压轴题专练)-单元速记·巧练(沪教版2020必修第二册)
更新时间:2024-04-01 13:37:09
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【推荐1】三个力
,
,
大小相等,作用于同一点O.要使它们的合力为零,应满足什么条件?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78e7d4bc85cf95d858b6d3051e5beff8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/809f928a25b77674be3116e2e79e6c65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8136e8bf2bde87aba070b76e3a3196.png)
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【推荐2】(1)证明:平行四边形的四边平方和等于对角线的平方和;
(2)在平行四边形
中,若
,求
面积的最大值.
(2)在平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d7a6c89515401e4810862c186ee899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解题方法
【推荐1】已知a,b,c分别为
三个内角A,B,C的对边,且
.
(1)求A;
(2)已知
的面积为
,设M为BC的中点,且
,
的平分线交BC于N,求线段AN的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d01d2956b453f7a29b4221cee240dbc.png)
(1)求A;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ca820a456491348e72587e4fe10bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32a41ab3f009c5d181f016a5613aecdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
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【推荐2】设O为
内任一点,且满足
.
(1)若D,E分别是边BC,CA的中点,求证:D,E,O三点共线;
(2)求
与
的面积之比.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee7d9f95385876b8ea36f53bd0b1d51d.png)
(1)若D,E分别是边BC,CA的中点,求证:D,E,O三点共线;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
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【推荐1】已知四边形ABCD,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e1c7f2d6c38921c7efa74776839da8.png)
.
(1)求向量
与
的夹角;
(2)当
,点
分别在
与
上,且
与
共线,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0e1c7f2d6c38921c7efa74776839da8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a29b4fb4f1d4fc66198ddf82bb830a.png)
(1)求向量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9795e7f5cb9b366776c41d8f3f43942.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bd98a891fa65f2fc6688001b03185d0.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4feee05b6e6ad5686515b07ff9adc519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.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/4dd4b9ad667f6da79bc3a5737cbc1eee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75f90e16e18b1e88ebb1ab811d06be76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd92ed9c7d216873545ea59101b6ce1b.png)
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【推荐2】如图所示,平行四边形ABCD中,
,
,H,M分别是AD,DC的中点,F为BC上一点,且
.
,
为基底表示向量
与
;
(2)若
,
,
与
的夹角为
,求
.
(3)设线段AM、FM的交点为
,在(2)的条件下,求
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7b9d8a08fc52c31cc1a7f527d18b55c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184359fe3cadc363cf4ebe586c2b3db4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/558098da135bc12e7fdca05d14c3848e.png)
![](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/4fe6d728b430549f00bb9c0a7bf8bf7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0d158d2784ff23566dcde9bf3c1af7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7a66059d36a4978d91c4aa74f1cccfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94e6495dc47b3139837684e83b6aae70.png)
![](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/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4516c0d5396e577db15fde23ee862f.png)
(3)设线段AM、FM的交点为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fccf606a352f0946c9593210784f6450.png)
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