如图,在平面直角坐标系中,点O为坐标原点,点
、
是
的两个顶点,
.
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698778589282304/2702338185003008/STEM/f3fc4af4-5ba9-4b5b-854a-7d1e4af18732.png)
(1)求直线
的解析式:
(2)点D在y轴正半轴上,连接
,以
为斜边,在
的上方作等腰直角三角形
,设点D的纵坐标为t,
的面积为S,求S与t之间的函数关系式(不要求写出t的取值范围);
(3)在(2)的条件下,连接
,点E为
的中点,连接
、
,若
,求点C的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12652efb124f262e3cbefaed4962bb58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d598b53ebe67b3576315001138268eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c2e198178b2ad07fb5cc8427690a28.png)
![](https://img.xkw.com/dksih/QBM/2021/4/13/2698778589282304/2702338185003008/STEM/f3fc4af4-5ba9-4b5b-854a-7d1e4af18732.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)点D在y轴正半轴上,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4739afd7311501e948aa4e1e5c1cb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789427b585e287c41289d38eafb9ff1a.png)
更新时间:2021-04-18 09:44:01
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相似题推荐
解答题-问答题
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困难
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【推荐1】如图,平面直角坐标系中,直线
分别交x轴、y轴于A、B两点(AOAB)且AO、AB的长分别是一元二次方程x23x20的两个根,点C在x轴负半轴上,且AB:AC=1:2.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/9f057c8b-30fe-451b-bcc6-ea24c22f6c73.png?resizew=165)
(1)求A、C两点的坐标;
(2)若点M从C点出发,以每秒1个单位的速度沿射线CB运动,连接AM,设△ABM的面积为S,点M的运动时间为t,写出S关于t的函数关系式,并写出自变量的取值范围;
(3)点P是y轴上的点,在坐标平面内是否存在点Q,使以A、B、P、Q为顶点的四边形是菱形?若存在,请直接写出Q点的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/9f057c8b-30fe-451b-bcc6-ea24c22f6c73.png?resizew=165)
(1)求A、C两点的坐标;
(2)若点M从C点出发,以每秒1个单位的速度沿射线CB运动,连接AM,设△ABM的面积为S,点M的运动时间为t,写出S关于t的函数关系式,并写出自变量的取值范围;
(3)点P是y轴上的点,在坐标平面内是否存在点Q,使以A、B、P、Q为顶点的四边形是菱形?若存在,请直接写出Q点的坐标;若不存在,请说明理由.
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【推荐2】如图1,在平面直角坐标系中,直线
:
与
交于点
,
与
轴,
轴分别交于A,B两点,
与x轴,y轴正半轴分别交于C,D两点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094b3afb3579cba2f0730bdbc8d781e8.png)
的解析式;
(2)如图2,连接
,若点P为y轴负半轴上一点,点Q是x轴上一动点,连接
,
,
,当
时,求
周长的最小值;
(3)如图3,将直线
向上平移经过点D,平移后的直线记为
,若点M为y轴上一动点,点
为直线
上一点,是否存在点M,使
是等腰三角形?若存在,请直接写出点M的坐标,并写出其中一个点M的求解过程;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f0c0aa4d3777dfd5cfca76e713e57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f5cfea0dfd90a428d75a1f82a153b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.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/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/094b3afb3579cba2f0730bdbc8d781e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b15febfda66e733f14aa7115ed4343a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a07c8017bd895910b9669783edd8fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e310ac26049fd114f77837f60938a17.png)
(3)如图3,将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f16108b3513153eb9c7fbd4ed237b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
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真题
【推荐1】如图,边长为1的正方形ABCD中,点K在AD上,连接BK,过点A,C作BK的垂线,垂足分别为M,N,点O是正方形ABCD的中心,连接OM,ON.
(1)求证:AM=BN;
(2)请判断△OMN的形状,并说明理由;
(3)若点K在线段AD上运动(不包括端点),设AK=x,△OMN的面积为y,求y关于x的函数关系式(写出x的范围);若点K在射线AD上运动,且△OMN的面积为
,请直接写出AK长.
(1)求证:AM=BN;
(2)请判断△OMN的形状,并说明理由;
(3)若点K在线段AD上运动(不包括端点),设AK=x,△OMN的面积为y,求y关于x的函数关系式(写出x的范围);若点K在射线AD上运动,且△OMN的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca83504e351d7516f61a3052d7a31859.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/23/0441d2ef-05ef-43e2-ae97-cb7bf44ee0fc.png?resizew=166)
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【推荐2】在四边形
中,
,
.
![](https://img.xkw.com/dksih/QBM/2023/10/8/3341597417693184/3342429680533504/STEM/94e18145a1ca4ca782bb18107fd36a83.png?resizew=485)
(1)如图,连接对角线
,若
,
,
,求
;
(2)如图,在四边形
中,若
为
的角平分线,点
、
分别为直线
,直线
上的点,连接
,
,
,其中
,求证:
;
(3)在(2)的条件下,当点
在直线
上运动时,连接
,取
中点
,连
、
,当
最小时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5441d73845911db1993bf903c4d8700f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://img.xkw.com/dksih/QBM/2023/10/8/3341597417693184/3342429680533504/STEM/94e18145a1ca4ca782bb18107fd36a83.png?resizew=485)
(1)如图,连接对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357d9412cb6b277a3e317d99135ab64b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/640f058b479299659893cf524ddf6544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
(2)如图,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.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/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/871d7b86e0dbec3b5623cd30597b899f.png)
(3)在(2)的条件下,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a73d7cf14b54902d8771fbe423ffd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b7a81007d46bcf2114a1ea1182b387.png)
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解题方法
【推荐3】探究
(1)发现:如图1,在平面内,已知⊙A的半径为r,且AB=a,P为⊙A上一动点,连接PB,易得PB的最大值为 ___________,最小值为___________;(用含a,r的代数式表示)
(2)应用:①如图2,在矩形ABCD中,AB=6,AD=4,E为AD边中点,F为AB边上一动点,沿EF将△AEF翻折得到△PEF,连接PB,则PB的最小值为___________;
②如图3,点P为线段AB外一动点,分别以PA、PB为直角边,作等腰Rt△APC和等腰Rt△BPD,连接BC、AD.若AB=7,AP=3
,求AD的最大值;
(3)拓展:如图4,已知以AB为直径的半圆O,C为弧AB上一点,且
,P为弧BC上任意一点,CD⊥CP交AP于D,若AB=6,则BD的最小值为___________.
(1)发现:如图1,在平面内,已知⊙A的半径为r,且AB=a,P为⊙A上一动点,连接PB,易得PB的最大值为 ___________,最小值为___________;(用含a,r的代数式表示)
(2)应用:①如图2,在矩形ABCD中,AB=6,AD=4,E为AD边中点,F为AB边上一动点,沿EF将△AEF翻折得到△PEF,连接PB,则PB的最小值为___________;
②如图3,点P为线段AB外一动点,分别以PA、PB为直角边,作等腰Rt△APC和等腰Rt△BPD,连接BC、AD.若AB=7,AP=3
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7881094ce2f907c3aaf664318ecd3e2d.png)
(3)拓展:如图4,已知以AB为直径的半圆O,C为弧AB上一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7a33191ed3b76002229f5cf5b33dd9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/22/c9fce203-53d4-4699-85d3-fa1fd9458196.png?resizew=292)
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【推荐1】已知如图,在![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
中,点
是
边上一点,连接
、
,
,
,点
是
上一动点,连接
.
![](https://img.xkw.com/dksih/QBM/2021/7/11/2761771139006464/2770421899108352/STEM/98475e5a-ef5c-4ce5-9d53-a74265ca5eaf.png?resizew=554)
(1)如图1,若点
是
的中点,
,求![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
的面积;
(2)如图2,当
时,连接
,求证:
;
(3)如图3,以
为直角边作等腰
,
,连接
,若
,
,当点
在运动过程中,请直接写出
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a702c324e0c76150540c3d32df802077.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2cc1d0bfd22c88286880b9da1f6f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2021/7/11/2761771139006464/2770421899108352/STEM/98475e5a-ef5c-4ce5-9d53-a74265ca5eaf.png?resizew=554)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f25a13423cebb3b19c9b9bbd21a7286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f60db833d4ff6b92c78029e8264ca1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2cf84b390b549c85d2d52d7e982e68.png)
(3)如图3,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f617ed720a28eef74ad8345ccda2f8ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1de77c66488139042756fadc7540072d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb55961fe96e155242d18d98e5c2261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2395720e6d6aeb7efdcd8e921849acf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20227c155003de7163d407daf0a5e74.png)
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【推荐2】定义:若一个圆内接四边形的两条对角线互相垂直,则称这个四边形为圆美四边形.
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932746577518592/2961194282713088/STEM/a39f7115-1654-4a83-9bb2-22dcc8fe056e.png?resizew=366)
(1)请你写出一个你学过的特殊四边形中是圆美四边形的图形的名称_____;
(2)如图1,在等腰Rt△ABC中,∠BAC=90°,交BC于点E,连接DE,若四边形ABDE是圆美四边形,求
的值;
(3)如图2,在△ABC中,经过点A、B的⊙O交AC边于点D,连接AE、BD交于点F,若在四边形ABED的内部存在一点P,连接PE交BD于点G,连接PA,PB⊥PE.
①求证:四边形ABED为圆美四边形;
②若α=60°,PA+PE=8,
=
.求DE的最小值.
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932746577518592/2961194282713088/STEM/a39f7115-1654-4a83-9bb2-22dcc8fe056e.png?resizew=366)
(1)请你写出一个你学过的特殊四边形中是圆美四边形的图形的名称_____;
(2)如图1,在等腰Rt△ABC中,∠BAC=90°,交BC于点E,连接DE,若四边形ABDE是圆美四边形,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b53dda09843bab8e3a5c8671752be0.png)
(3)如图2,在△ABC中,经过点A、B的⊙O交AC边于点D,连接AE、BD交于点F,若在四边形ABED的内部存在一点P,连接PE交BD于点G,连接PA,PB⊥PE.
①求证:四边形ABED为圆美四边形;
②若α=60°,PA+PE=8,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0255ce3e1ba26fca432dd4e3de6b1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
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