“四二一广场”是重庆第一中学校的文化地标(如图1),广场中心的建筑形似火炬宛若花开,三朵“花瓣”都是拓扑学中的莫比乌斯带(如图2).将莫比乌斯带投影到平面上,会得到无穷大符号“∞”.在平面直角坐标系中,设线段AB长度为2a(
),坐标原点O为AB中点且点A,B均在x轴上,若动点P满足
,那么点P的轨迹称为双纽线,其形状也是无穷大符号“∞”(如图3).若
,点P在第一象限且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33fc05839e6ff475c407d14a32ebe93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10095f96af5d08c531ed47ae3c5e4032.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c87f372c0ef272e805510a07d47092b.png)
A.![]() | B.![]() | C.![]() | D.2 |
更新时间:2024-05-26 11:36:53
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【推荐1】在平面直角坐标系中,定义
为两点
,
之间的“折线距离”.则下列命题中:
①若
点在线段
上,则有
.
②若点
,
,
是三角形的三个顶点,则有
.
③到
,
两点的“折线距离”相等的点的轨迹是直线
.
④若
为坐标原点,
在直线
上,则
的最小值为
.
真命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bea37e25ba5e11e5e2c428996f74e5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6f5adf13b4214666292dd64b947741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af405a054bfe7fb7ce40e48d816467e1.png)
①若
![](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/2d877b3cee3acda817fec3e56b1e87b8.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](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/7e90cad331bc01cd24e280affd46f610.png)
③到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cf8af6e62058cc4e2d83d5da7f4c68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f36374ce95a4945d0e58264c2b271f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c10877f24b1b2c7b2265a301f2202f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3bcb4828b16c8e845492f1a53ddd9a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b91d650c2fc1a741fabdb333b09aeb6.png)
真命题的个数为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】斜率为
的直线
过抛物线
焦点
,交抛物线于
,
两点,点
为
中点,作
,垂足为
,则下列结论中不正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd2f7fe4644e874681b7802f51cc730c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bbfabcee4a8a0a9a5ea8eaebbf5b7e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/290b954206bbc5c366c490c27e875471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
A.![]() | B.![]() |
C.点![]() | D.点![]() |
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【推荐1】曲线
:
,其中
,
均为正数,则下列命题错误 的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2eb7270c94fc150677edf31d82ae1900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.当![]() ![]() ![]() ![]() |
B.当![]() ![]() ![]() |
C.当![]() ![]() ![]() ![]() |
D.当![]() ![]() ![]() ![]() ![]() |
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【推荐2】在平面直角坐标系中,定义
为两点
,
的“切比雪夫距离”,并对于点P与直线l上任意一点Q,称
的最小值为点P与直线l间的“切比雪夫距离”,记作
,给定下列四个命题:
:对于任意的三点A,B,C,总有
;
:若点
,直线
,则
;
:满足
的点M的轨迹为正方形;
:若点
,
,则满足
的点M的轨迹与直线
(k为常数)有且仅有2个公共点;则其中真命题的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb5829cf58fa332ad6aa79b676724c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ff82ebdfad5e7de1c7487b0b817a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a53e311ee0b5085e7e5a45c606daa5d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87ab04028bf648fbb8c9296acdeaaf5a.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6efc72de5cceb54c6959af52491ca762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adad9633b73dfbbb3d84b4f15979e99e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae104d6d67d114b588a5680b124b0e45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94922febcf02e84401ab8631890532df.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87b21b872313f7d8c5b606981f954a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a78f0fed4f5d8adb7130a6a67568ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc119550ce4fc5f3d1daf996e7243bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6dc791ae552024ea0df7905bf190f30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697c20fca284394bf5d5b9e5f6d952e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360843b9fdab18fdea2cef744a635851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead6a3dbd03539ef5e0807be57bb1e17.png)
A.1 | B.2 | C.3 | D.4 |
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