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解题方法
1 . 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)
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2020-03-03更新
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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