解题方法
1 . 设
为
的重心,
为
的重心,过
作直线
分别交线段
,
(不与端点重合)于
,
.若
,
.
(1)求证
为定值;
(2)求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81722445de00f3cfcc3cb97e45b0d8dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc1b68f13fed987f5209197de7bc8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81722445de00f3cfcc3cb97e45b0d8dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e132194c1ff4c62aadf52561be1c89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28c4eaa1e5dd08305162415799a063d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e17e3fee22f1387717efa36456a196.png)
(1)求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f0b84ee4ed90face0993d4f4dda379.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
您最近一年使用:0次
名校
解题方法
2 . 已知平面上三点A,B,C的坐标依次为
,
,
.
(1)若
为直角三角形,且角A为直角,求实数k的值;
(2)在(1)的条件下,设
,
,若
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed37520eb88c41828ad26f0a2b2de971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47fa19dde2fb0cc8274390a05a6095cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00999ca76efc3763c13c6b4260c4498.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
(2)在(1)的条件下,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e49d2c72a35f1ce4d1d26574934a014.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a303aee4aea8d84cfa947002b0eaeb1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768434e9275596ec3f60ec46454a16e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbae94f2dd5086f7ddbe18407a978e9b.png)
您最近一年使用:0次
2020-03-03更新
|
729次组卷
|
4卷引用:江西省南昌市第二中学2019-2020学年高二下学期期末考试数学(文)试题
13-14高一下·湖南长沙·期中
名校
3 . 在平面直角坐标系中,
为坐标原点,
三点满足
.
(1)求证:
三点共线;
(2)求
的值;
(3)已知
,
的最小值为
,求实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f81983d4745fe5bb69c1da13e36dd92.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf5bfb21cecf0851e5e78e0d036d32d.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50fa39ecb42f9ebef0503cb8d330c6d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59ae1d3222e2c82e0cfc79938ed1e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8b4bbd2f9912adfc9864c0e1e76a9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2017-06-23更新
|
987次组卷
|
4卷引用:江苏省苏州市2016-2017学年高一下学期期末备考试题分类汇编:平面向量中的最值问题探究数学试题
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