如图,点C在以AB为直径的半圆上,AB=8,∠CBA=30°,点D在线段AB上运动,点E与点D关于AC对称,DF⊥DE于点D,并交EC的延长线于点F.下列结论:①CE=CF;②线段EF的最小值为
;③当AD=2时,EF与半圆相切;④若点F恰好落在BC上,则AD=
;⑤当点D从点A运动到点B时,线段EF扫过的面积是
.其中正确结论的序号是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38387ba1cadfd3dfc4dea4ca9f613cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b91d650c2fc1a741fabdb333b09aeb6.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/2851342c-53a0-490c-adea-2bce8382894a.png?resizew=167)
2014·浙江舟山·中考真题 查看更多[9]
更新时间:2019-01-30 18:14:09
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【推荐1】如图,正方形ABCD与正方形CEFG,E是AD的中点,若AB=2,则点B与点F之间的距离为_______ .
![](https://img.xkw.com/dksih/QBM/2019/6/4/2218617070075904/2221941712723969/STEM/ad8c501c09b14b6d9142cd2d6a9ea8bf.png?resizew=170)
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【推荐2】在平面直角坐标系中,将一点的横坐标与纵坐标互换后得到的点称为它的“互换点”,点M和A为函数
的图象第一象限上的一组互换点(M点在A点的左侧).直线AM分别交x轴、y轴于C、D两点,连接AO交双曲线另一支于点B,连接BM分别交x轴、y轴于点E,F.则下列结论正确的是______ .(写出所有正确结论的序号)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2893008106307584/2894942011326464/STEM/cf5b679e-89aa-443c-a47b-8a22bc09d2dc.png?resizew=254)
①
;②
;③若
,则
;④若
,M点的横坐标为1,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/412de93a9a3a2dfbb727b793453c4196.png)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2893008106307584/2894942011326464/STEM/cf5b679e-89aa-443c-a47b-8a22bc09d2dc.png?resizew=254)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aa2e2b20ff0f0601ac7f973d0b50c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac526a082f4475715399073306517034.png)
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【推荐1】如图所示,已知在平面直角坐标系
中,点
,点
是横轴正半轴上的一个动点,
经过原点
,且与
相切于点
.当
轴时,点
的坐标为__________ ;当射线
与直线
相交时,点
的横坐标
的取值范围是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
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【推荐2】如图,在平行四边形
中,以点
为圆心作
与对角线
相切,点
是
上一个动点,连接
交
于点
,则
的最小值是______ .
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【推荐1】如图.在直角坐标系中,矩形ABCO的边OA在x轴上,边OC在y轴上,点B的坐标为(1,3),将矩形沿对角线AC翻折,B点落在D点的位置,且AD交y轴于点E,那么点D的坐标为______ .
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【推荐2】如图,已知在Rt△ABC中,∠ACB=90°,
,BC=8,点D在边BC上,将△ABC沿着过点D的一条直线翻折,使点B落在AB边上的点E处,联结CE、DE,当∠BDE=∠AEC时,则BE的长是 .
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【推荐1】如图,在
中,
,
是
的外接圆,在劣弧
上存在点
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,延长
交
于点
,连结
交
于点
,连结
,若
,
半径为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbcc7b4553cf6c8773938b3ef2e646b0.png)
_____ .
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【推荐2】如图,∠BAC=120°,AD平分∠BAC,且AD=4,点P是射线AB上一动点,连接DP,△PAD的外接圆于AC交于点Q,则线段QP的最小值是______ .
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