已知三角形的顶点是
,求这个三角形三边所在直线的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55f12c3a4056ba268803780d8d159a31.png)
21-22高二·全国·课后作业 查看更多[2]
更新时间:2022-03-01 10:19:49
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适中
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解题方法
【推荐1】已知抛物线![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc58c62444bf42a25289c45425a00f2.png)
,点
为抛物线焦点.过点
作一条斜率为正的直线l从下至上依次交抛物线于点
与点
,过点
作与l斜率互为相反数的直线分别交x轴和抛物线于
、
.
(1)若直线
斜率为k,证明抛物线在点
处切线斜率为
;
(2)过点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f26d721b107f8b2bc88f3eb0f42c70.png)
作直线分别交x轴和抛物线于
、
,过点
作直线分别交x轴和抛物线于
、
,且
,直线
斜率与直线
斜率互为相反数.证明数列
为等差数列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc58c62444bf42a25289c45425a00f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75de1947893e5c7a4d98d4458398fd6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b9cb8e6ff801523b0304576cd69fd2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
(1)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473913c0887bb64d386f4c02f1853452.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53fc303cfac1c7534451fb0789e68340.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f26d721b107f8b2bc88f3eb0f42c70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482763b14d24335c055a2f40fbd959a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a09ec2d93ba8c1e03c87f72847b2e0d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/786943ad927681a7669f7657189b8e94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/786943ad927681a7669f7657189b8e94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/477ff751d24f8169d1530d681cb6238d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee309657bd64d532c45fa5bd2dd70e0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f20bdc8acb733f90c754c77a24eeb62f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bab86a8763fd18721a95f2ba200e233.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de8570a13f722ac57f7d9d970082d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16eb52ba8bbc8988475dd96ca0858eb3.png)
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解题方法
【推荐2】在直角坐标系
中,曲线
与
轴交于
,
两点,点
的坐标为
.当
变化时,解答下列问题:
(1)能否出现
的情况?说明理由;
(2)求过A,
,
三点的圆被
轴截得的弦长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee7af19bc3cf8457d7095152ed8e373.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f5cd8f5dd05a04331f43a2ba55953b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f399b1f59ee66176b4038e91a3eb1bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1242ec96ac54e2fd418988d5190a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(1)能否出现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
(2)求过A,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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【推荐1】已知
三个顶点是
.
(1)求
边的高
所在直线方程;
(2)求
外接圆的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279c0b059accdc5ca82fc8d7187325e7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】已知函数
,
.
(1)求曲线
在
处切线的方程;
(2)若直线l过坐标原点且与曲线
相切,求直线l的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdc873fc03e6e4d3c4ba02f8b1147b20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32b3fb8383857c7c9b79dc08b5472ef.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19e5a6085462d1c7c304dd5f669e3a71.png)
(2)若直线l过坐标原点且与曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
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【推荐1】求下列直线的方程.
(1)经过点
,且一个法向量为
;
(2)经过点
,且一个方向向量为
.
(1)经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad20e2bc6576fc461419f8f138d26e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf472c50cff3842766b47d0a73dd2b3.png)
(2)经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83eacd38727f29b2c2c68ee309080fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689ccda15b7817beea7fc6b97efe08b9.png)
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【推荐2】(1)已知直线l与两直线
和
平行且距离相等,求l的方程.
(2)已知直线
过点
,
过点
,如果
,且
与
之间的距离为5,求
,
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d7fe6da60974dfed0f9c5b40b5ad17d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae5f69a1595ec04a16fad215f1d4e600.png)
(2)已知直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383f12cb70ca55eba4ff012771dbfa9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fe2c124d5bbbbe666ee145cd454b6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/027830fc47290062692964077ee481e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
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