2021高二·江苏·专题练习
名校
1 . 已知
的三个顶点分别为
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/55caebd3-573b-44ed-ba5a-6424e07b7617.png?resizew=219)
(1)若过
的直线
将
分割为面积相等的两部分,求b的值;
(2)一束光线从
点出发射到BC上的D点,经BC反射后,再经AC反射到x轴上的F点,最后再经x轴反射,反射光线所在直线为l,证明直线l经过一定点,并求出此定点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/444a4b2494e57a3544fd4ecaa105085d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/346c0ff07b0cc9fac50c93ccc9bea549.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f47a2c1a3a93032fd7673f6ea63b876f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/55caebd3-573b-44ed-ba5a-6424e07b7617.png?resizew=219)
(1)若过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9bcca984112ce384ecd262f0cb3cd9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ece77247e51cbe634a38d4fa34bc1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
(2)一束光线从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722e3eaee365c01a0e9e84fc88adfcd0.png)
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2021-09-03更新
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2437次组卷
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2021高二·江苏·专题练习
解题方法
2 . 在平面直角坐标系
中,直线
,
,
,
,
(
).
(1)证明直线
和
过同一个定点
,并求
到直线
的距离
;
(2)若
与
交于
点,
与
交于
点,记
,
,求
的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/662ce2fa01b82f84c730d11afc6000dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f49d9c3013da5e3c3a54c0decb56c33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09105430634bbf0b5ff6ea0f126fb3a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d23314be1762a3e81b64855d81e7c71.png)
(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed0e33ce86afd345af341c43693b99c7.png)
(1)证明直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f2813ee8f26cca880b6427f5f545d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f2813ee8f26cca880b6427f5f545d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b05bf23fc23d66e05af9eb79a7a7d17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf3614b34fdc6fda470179e84cc1f693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5224a7da7fe6bc28971ce4c277f88588.png)
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