如图,在平面直角坐标系中,半径为1的
的圆心
的坐标为
,点
为
轴上一个动点,过点
作
的切线,切点为
于点
.下列结论:①
的最大值为1;②
的最小值为
;③
的最大值为
;④若点
,则
的面积为
.则其中正确的结论有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/11ab7df3-a61a-4892-9f7f-281ef2902e04.png?resizew=165)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4772c835cbe626040ecc4df30e6f0ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0a36d60b5e844ae2b56769bb212910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddbb898663f98b8400a897913b4d3102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/11ab7df3-a61a-4892-9f7f-281ef2902e04.png?resizew=165)
A.4个 | B.3个 | C.2个 | D.1个 |
更新时间:2024-02-26 10:05:29
|
相似题推荐
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【推荐1】如图,△ABC和△ECD都是等腰直角三角形,△ABC的顶点A在△ECD的斜边DE上.下列结论:其中正确的有( )
①△ACE≌△BCD;②∠DAB=∠ACE;③AE+AC=AD;④AE
+AD
=2AC![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
①△ACE≌△BCD;②∠DAB=∠ACE;③AE+AC=AD;④AE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
A.1个 | B.2个 | C.3个 | D.4个 |
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【推荐2】如图,正方形ABCD中,AB=3,点E在边CD上,且CD=3DE.将△ADE沿AE对折至△AFE,延长EF交边BC于点G,连接AG,CF.下列结论:①点G是BC中点;②∠EAG=45°;③FG=FC.其中正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/5/9/2982115113410560/2988886067445760/STEM/b91f2ebb-0fc6-4c53-8a40-b2283924e2a2.png?resizew=126)
![](https://img.xkw.com/dksih/QBM/2022/5/9/2982115113410560/2988886067445760/STEM/b91f2ebb-0fc6-4c53-8a40-b2283924e2a2.png?resizew=126)
A.①② | B.③ | C.②③ | D.①②③ |
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【推荐1】一张半径为2的半圆图纸沿它的一条弦折叠,使其弧与直径相切,如图所示,O为半圆圆心,如果切点分直径之比为3:1,则折痕长为( )
![](https://img.xkw.com/dksih/QBM/2019/1/10/2115708824305664/2117212934053888/STEM/2ceea23fa27746898e5b8977dd2e46c4.png?resizew=139)
![](https://img.xkw.com/dksih/QBM/2019/1/10/2115708824305664/2117212934053888/STEM/2ceea23fa27746898e5b8977dd2e46c4.png?resizew=139)
A.3 | B.![]() ![]() | C.![]() ![]() | D.2![]() |
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【推荐2】如图,等边△ABC内接于⊙O,D是
上任一点(不与B、C重合),连接BD、CD,AD交BC于E,CF切⊙O于点C,AF⊥CF交⊙O于点G.下列结论:①∠ADC=60°;②DB2=DE•DA;③若AD=2,则四边形ABDC的面积为
;④若CF=2
,则图中阴影部分的面积为
.正确的个数为( )
![](https://img.xkw.com/dksih/QBM/2022/1/7/2889217838243840/2889945731039232/STEM/effc8229-55a1-4fe4-8b35-1cf3f68c8d54.png?resizew=312)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a2b34fbfbe30bea03ef04ee293d8368.png)
![](https://img.xkw.com/dksih/QBM/2022/1/7/2889217838243840/2889945731039232/STEM/effc8229-55a1-4fe4-8b35-1cf3f68c8d54.png?resizew=312)
A.1个 | B.2个 | C.3个 | D.4个 |
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解题方法
【推荐1】如图,AB为圆O的直径,C为圆O上的一点,D为BA延长线上的一点,
,线段DF分别交AC,BC于点E,F,且
=45°,圆O的半径为5,
,则CF的长( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/6cbbc75d-4921-4864-9536-a1a56a303069.png?resizew=238)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd6fe78f6cfdfefd6d8be45473b25b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adcae9d00980803e5955228d1e217abe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3568f51bde4e391c8f08ff3d55989aef.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/24/6cbbc75d-4921-4864-9536-a1a56a303069.png?resizew=238)
A.![]() | B.3 | C.![]() | D.4 |
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【推荐2】如图,已知点
,
,射线
绕点A逆时针旋转30°,与
轴交于点
,则过
,
,
三点的二次函数
中
,
的值分别为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f61a4f49d47ad1c1109275370214963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49cba284d675a3028d7a8d54f1f8ae70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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A.![]() ![]() | B.![]() ![]() | C.![]() ![]() | D.![]() ![]() |
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