解题方法
1 . 已知
中,点E,F分别在边AB,AC上,且满足
,连接BF,CE,交点为P.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/1b1576d3-67b2-4e28-b0d4-37dbd3193121.png?resizew=254)
(1)当点P为
的重心时,求m,n的值;
(2)当
时,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45e078206130cd30f3de25cf2ede851d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/27/1b1576d3-67b2-4e28-b0d4-37dbd3193121.png?resizew=254)
(1)当点P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc899d37ace8055007a36c26703daa2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef93b777f548aad8e3f5a0973928366d.png)
您最近一年使用:0次
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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
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728次组卷
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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