如图,在四边形中,
,
,
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d92b7b1322cd8ee9a04b26163eaaad.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/630b309396f714a41adaf5b8cd5be04a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6996aa31bf1486ced60c2249a6e6989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ba95116dc790b935d65bf540799cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4bf2ed4e49655ce765ba6ffbb6c7d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d744165d6aad705f64de41a9d931750a.png)
①当t为何值时,四边形的面积等于
?
②当t的值为______时,以B,P,Q三点为顶点的三角形与相似.
更新时间:2024-03-21 17:03:51
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适中
(0.65)
【推荐1】如图,在线段AB上取C,D两点,已知
cm,
cm,且
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
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名校
【推荐1】如图,
是四边形
外接圆O的直径,
,延长
到E使得
,作射线
交
的延长线与F,
交
与G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/16/52a2800d-eb67-4746-b9e2-c9af932d6de2.png?resizew=211)
(1)求证:
与
相切;
(2)若
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01cd2bf7c88e24c91625e0f20ba2a4bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d3833ff8c5317cc3ced1570aa19785.png)
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适中
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【推荐2】在菱形
中,
,点
在射线
上运动,点
在射线
上,
.
(1)当点
在线段
上时(如图①),猜想线段
与
,
之间的数量关系,并证明你的结论;
(2)当点
在线段
的延长线上时(如图②),线段
与
,
之间的数量关系又如何,写出你的结论,并加以证明;
(3)连接
,当
为直角,且
时(如图③),求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/18/21cbb2a4-9780-44c6-92bd-83ab7d058cef.png?resizew=418)
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解答题-证明题
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【推荐1】已知:如图,在
中,
,
,点D在BC边上运动,作
,DE交AC于E.
![](https://img.xkw.com/dksih/QBM/2016/10/7/1574245588598784/1574245595381760/STEM/fe1251b81ac24f23a41e4bd039fb72ac.png)
(1)求证:
;
(2)当AD=DE时,求BD的长;
(3)当AE=DE时,求BD的长.
![](https://img.xkw.com/dksih/QBM/2016/10/7/1574245588598784/1574245595381760/STEM/06f0ba28853d4b838e1f882d1223a5a9.png)
![](https://img.xkw.com/dksih/QBM/2016/10/7/1574245588598784/1574245595381760/STEM/11d6472f4a5d46bcae38b33266e7cb00.png)
![](https://img.xkw.com/dksih/QBM/2016/10/7/1574245588598784/1574245595381760/STEM/057f9c341e794c41b2bd79918b41f378.png)
![](https://img.xkw.com/dksih/QBM/2016/10/7/1574245588598784/1574245595381760/STEM/181c182fc2fc4634ab00052a65d2dffb.png)
![](https://img.xkw.com/dksih/QBM/2016/10/7/1574245588598784/1574245595381760/STEM/fe1251b81ac24f23a41e4bd039fb72ac.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/10/7/1574245588598784/1574245595381760/STEM/48d7877974fd43729f85a4591e31a72a.png)
(2)当AD=DE时,求BD的长;
(3)当AE=DE时,求BD的长.
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【推荐2】如图,在平面直角坐标系中,四边形OABC是边长为1的正方形,顶点A、C分别在x,y轴的正半轴上.点Q在对角线OB上,且QO=OC,连接CQ并延长CQ交边AB于点P.求点P的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/17/eedba721-dca2-4ac0-aa46-6a5748d2cb92.png?resizew=160)
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