如图所示,
为
的直径,点
为
上方圆周上一动点,过点
作
,分别交
、圆周于
、
两点,作射线
交
于点
,已知
.
![](https://img.xkw.com/dksih/QBM/2021/4/21/2704779075076096/2706974939275264/STEM/52cc8e50543145bab75c926af0a0c549.png?resizew=129)
(1)求证:
为
的切线;
(2)填空:①连接
、
,当
______时,四边形
是菱形;
②若已知
,则
______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60c120971d0334842b311e819e4632e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ceb08fcdde01c2ebf8bafdeff439c5.png)
![](https://img.xkw.com/dksih/QBM/2021/4/21/2704779075076096/2706974939275264/STEM/52cc8e50543145bab75c926af0a0c549.png?resizew=129)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)填空:①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee56718fa24de61ba70fe99f7d8c482.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2828ba3dd81de032f7130b1645ea13a.png)
②若已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f393a0ff5f01a41e1f4c9cfd723adeb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65984d934d0f6ba7e709b86034dcc2c.png)
更新时间:2021-04-24 22:57:31
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【推荐1】如图,抛物线
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求抛物线的解析式;
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解题方法
【推荐2】如图,四边形ABCD是正方形,点O为对角线AC的中点.
(1)问题解决:如图①,连接BO,分别取CB,BO的中点P,Q,连接PQ,则PQ与BO的数量关系是 ,位置关系是 ;
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【推荐1】如图,在□ABCD中,∠ABC,∠BCD的平分线分别交AD于点E,F,BE,CF相交于点G.
(1)求证:BE⊥CF;
(2)若AB=a,CF=b,求BE的长.
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![](https://img.xkw.com/dksih/QBM/2020/6/22/2490083346456576/2492516102709249/STEM/aede0e8bf86d4f068cbeb53f2b542a27.png?resizew=170)
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解题方法
【推荐2】如图,矩形
的顶点
、
分别在
轴、
轴的正半轴上,点
的坐标为
,一次函数
的图象与边
、
分别交于点
、
,且
.点
是直线
上的一个动点.
(1)求
的值;
(2)连结
,若三角形
的面积与四边形
的面积之比为
,求点
的坐标;
(3)设点
是平面内的一点,以
、
、
、
为顶点的四边形是菱形,直接写出
的坐标.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3654254401fc902c3cb4912969f21f88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15206717884bea18dfe2d7099489f849.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1220cf7442bc7658dbd74a845a62dfce.png)
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(3)设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/2021/6/23/2749384744304640/2752057642057728/STEM/5a7dd402-3031-4f14-bb4e-e10912d3f21f.png)
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【推荐1】如图,AB是⊙O的直径,点C在圆O上,BE⊥CD垂足为E,CB平分∠ABE,连接BC
(1)求证:CD为⊙O的切线;
(2)若cos∠CAB=
,CE=
,求AD的长.
(1)求证:CD为⊙O的切线;
(2)若cos∠CAB=
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【推荐2】如图,
为
的直径, 弦
,
是
延长线上一点,
.
是
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(2)求证:
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解答题-作图题
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名校
【推荐1】等边
中,
、
、
分别是
、
、
上的点,若
.
(1)求
的度数;
(2)若
是
的中点,连接
并延长交
于点
,补全图形并探究
与
之间的数量关系;
(3)若
,过
作
交
于点
交
于点
,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51cfa3909b5a2312eb53a235779673bc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/b062a9da-e928-4528-a93d-78e9679995a9.png?resizew=259)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6c19410c7abeae002ca97cfad4c791f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea147ada4f0aefdd3808a6a1133792eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db529de474a033a56c138825d0b0c3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
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【推荐2】已知.矩形ABCD中,E为边AB上一点.F为CE上一点,AB=3.
(1)如图1,E为AB中点,∠BFC=90°,求
的值;
(2)如图2,直线AF交BC于G,且AF=FG,求
的值;
(3)如图3,若BF=2,DF=5,∠BFD-∠FBC=90°求CF的值.
![](https://img.xkw.com/dksih/QBM/2020/12/8/2609804492095488/2613956225155072/STEM/adf7eceea0674848992d30c3c3bee896.png?resizew=230)
![](https://img.xkw.com/dksih/QBM/2020/12/8/2609804492095488/2613956225155072/STEM/cb87d49ee24f40d2865c05a56a63fd50.png?resizew=223)
(1)如图1,E为AB中点,∠BFC=90°,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37106d84f2c3b97022ca9579470660a9.png)
(2)如图2,直线AF交BC于G,且AF=FG,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89f6ccb4459f196a783cfe3d19a3ddc2.png)
(3)如图3,若BF=2,DF=5,∠BFD-∠FBC=90°求CF的值.
![](https://img.xkw.com/dksih/QBM/2020/12/8/2609804492095488/2613956225155072/STEM/adf7eceea0674848992d30c3c3bee896.png?resizew=230)
![](https://img.xkw.com/dksih/QBM/2020/12/8/2609804492095488/2613956225155072/STEM/cb87d49ee24f40d2865c05a56a63fd50.png?resizew=223)
![](https://img.xkw.com/dksih/QBM/2020/12/8/2609804492095488/2613956225155072/STEM/260fc8594ac64b619b0025ba52cab644.png?resizew=226)
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