1 . 在平面直角坐标系中, 记
为点
到直线
的距离, 则当
变化时,
的最大值与最小值之差为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a39eb343f10b190dcba68fd1e8bb37f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdee4045d21a57f58bdbc7a3183d5f5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85952754cbc607e5a0d01332cd26be83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
A.2 | B.3 | C.4 | D.6 |
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2 . 已知抛物线
的焦点为
,点
在
上,若
,则
到直线
的距离为:________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c32d1cbd3ee6d1a210a8eae153ac5bc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7763fe9b98015f0022975a759756d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/639c3d2ff5ee566fcc1b69c65712a661.png)
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名校
解题方法
3 . 已知点
在由直线
,
和
所围成的区域内(含边界)运动,点
在
轴上运动.设点
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c608def11fa0e2b34f05592ef1d11fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8076b511e27939c629762296b8cfd08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bdb67343b798e823c80e689f5972c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/320d197a25fc99f1dff61d81b815b85c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 如图,在棱长为2的正方体
中,
为棱
的中点,
为棱
上一动点.给出下列四个结论:
①存在点
,使得
平面
;
②直线
与
所成角的最大值为
;
③点
到平面
的距离为
;
④点
到直线
的距离为
.
其中所有正确结论的个数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/4/a86a51e6-2969-40aa-8bc7-121ee837a94b.png?resizew=168)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/394c5d2f55221975503be8aa18022480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
①存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f9d682e5d3cc8573574d8d11636758.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d49f8a63ddbca52039fa9ab44cda6b29.png)
③点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea848cd2aa3a464618020475097949fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
④点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38be38165dc2307982fc57001a447c56.png)
其中所有正确结论的个数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/4/a86a51e6-2969-40aa-8bc7-121ee837a94b.png?resizew=168)
A.1 | B.2 | C.3 | D.4 |
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5 . 两条直线
与
之间的距离是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47816cca5e9c541a3a59c4eebd99ba93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b0c747d1d8f633ac01f2b06a110d5e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 已知直线
,则
与
的交点坐标为_____________ ;若直线
不能围成三角形,写出一个符合要求的实数
的值________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23bbccdfe14e11a8996f8a2aaeb2328e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0c5ebbf2979ed2582483eb2a0fb32c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b77fe8ec3ccc645db9a69d16a5589965.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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解题方法
7 . 已知
的三个顶点分别为
.
(1)设线段
的中点为
,求中线
所在直线的方程;
(2)求
边上的高线的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe7578975220d8461991ba837f2acf22.png)
(1)设线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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8 . 若直线l:
与直线
的交点位于第一象限,则直线l的倾斜角的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4709c5c3f467af9e9fd1eb0644d5e1b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1fc37ac7805d65dd49e2e54643e819f.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
9 . 已知点
.
(1)求过点
且与直线
平行的直线
的方程;
(2)求点
到直线
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b30c8e2ab925b10ba777354d48a1d7.png)
(1)求过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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10 . 点
到直线
的距离是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/610cc961f705bbca73f6a5066e9b136e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd1840b04818ac42b9a6b063cd7ffe0.png)
A.1 | B.2 | C.![]() | D.![]() |
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