已知,在
中,
,点
是
的中点,点
是边
上一动点(点
不与
,
,
重合),连接
.过点
、点
分别作直线
的垂线,垂足分别为点
和点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/ae658725-df7a-410b-bdbf-e500fc500f05.png?resizew=547)
(1)如图1,当
时,猜想线段
和
之间的数量关系是______,位置关系是______.
(2)如图2,当
时,判断上述(1)中结论线段
和
之间的数量关系是否成立,若成立请说明理由.
(3)如图3,当
,若
,
,且
是等腰三角形,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](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/2cdba1337ec85fa9722cb4b320a82ae6.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/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/13/ae658725-df7a-410b-bdbf-e500fc500f05.png?resizew=547)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c328690bedf40f97f00359b316ddbda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
(3)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5324030181e5f55e0cb04918dd9d5b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456c19aa403d4f71656c8918eeeed718.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b2f9aa11a47087e5fc483cf712ca9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c71c49dc9a9de1a0221769e4eb8616.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
更新时间:2022-06-08 13:16:22
|
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】在平面直角坐标系
中,已知点A在y轴负半轴上.
,
,
在抛物线上
,则
________;
_______;
(2)在(1)的条件下,若点D在抛物线上,且
轴,是否存在四边形
为菱形?请说明理由;
(3)如图2,已知正方形
的顶点B,D在二次函数
(a为常数,且
)的图象上,点D在点B的左侧,设点B,D的横坐标分别为m,n,请求出m,n满足的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19b62194097ac66a5093c57fca2f5b4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fb6fd712d967a36c027693a54f91470.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be41a8e614d52be851fa5d4461e570bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05f3023b526438933a05bed6f671730d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
(2)在(1)的条件下,若点D在抛物线上,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f4c57da0931466032ff40ec449650ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)如图2,已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e10e1c43b86a8cd4360ca9b57232164.png)
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【推荐2】在平面直角坐标系
中(如图),已知直线l:
交x轴于点A,交y轴于点B,点C在x轴正半轴上,且
.点D在线段
上,且
,过点C作
的垂线,交
的延长线于点E,连接
.
(1)求点D的坐标;
(2)求证:
;
(3)如果点P是直线
上的动点,连接
,当
与
相似时,求点P坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fceb9eb57ca36db386ffafeda213599c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85bdcc2742be52cc80ba7dbe79f9a574.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1748064cf09e888d16f961d7dbea29ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802240838201171d8762fe92112fa3ab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/11/d6d1eca5-b8ca-4643-b43a-46c1c4b22777.png?resizew=170)
(1)求点D的坐标;
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
(3)如果点P是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4336efb6d0689ddad55295e336340d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐1】在平面直角坐标系中,直线
分别与
轴、
轴交于点
、
,直线
交
轴于点
,交
轴于点
,
,
,
的面积为24.
(1)如图1,求点
的坐标;
(2)如图2,点
为
上一点,连接
并延长至点
,分别连接
,
,延长
交
于点
,若
,
,求点
的坐标;
(3)如图3,在(2)的条件下,点
为第一象限内一点,分别连接
、
、
,点
为
上一点,连接
,
,
,
,延长
交
轴于点
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df74a82d52fa9d42780887e48fba8d08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/0e019d61-9491-4fca-86c3-fc456f52e73c.png?resizew=454)
(1)如图1,求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc801a157b838dbba1df6041609dc005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01476dfb5970e27f54f742c27b9515f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图3,在(2)的条件下,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67f66515ffaf963c267e6a2353b00d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a06e37fe3a83c793737ed73c4092b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60945033121b4ffa25c55309c0dd43d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】在等腰
中,
于点H,
平分
交
,
分别于点E,F.
;
(2)在等腰
外有一点D,连接
.
(ⅰ)如图2,求
的度数;
(ⅱ)如图3,
,过点C作
交
延长线于点M,连接
,
.若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4744b427f036dfbc6db68c87cd5c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac3d3b55561ec5d4acc242ecd1c7f41.png)
(2)在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d8d991cf47e2a4e93c039e938f5f632.png)
(ⅰ)如图2,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3981e7286d41960daf4e110c1c84e03a.png)
(ⅱ)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59182f25fcf22afc79e28ded936de018.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a8217815edff97e8ea18b698de9c5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83042953e7f15e984b2da2ee9ca678d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/836effa5b91f7caa582394ba998612e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/464c24c1b5c93ac4bc6752fa1f8e4f9e.png)
您最近一年使用:0次
解答题-问答题
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困难
(0.15)
名校
【推荐1】如图,直线
:
交y轴于点A,交x轴于点B,直线
经过点A与轴x交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/8/cf7623f8-014c-46a7-a931-b100362e09b4.png?resizew=542)
(1)求直线
的解析式;
(2)如图2,直线
交
于点
,点M在线段
上,连接
交y轴于点H,设点M的横坐标为t,
的面积为S,求S与t之间的函数关系式;(不要求写出自变量t的取值范围)
(3)如图3,在(2)的条件下,线段
绕点M逆时针旋转90°得到线段
,过点B作直线
的垂线,垂足为F,连接
交
于点G,连接
,当
是锐角三角形,
时,求点E的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023ab3a7eb0f59993c7608576e47c0f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4983fabd2d706fca67786e581052df1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/8/cf7623f8-014c-46a7-a931-b100362e09b4.png?resizew=542)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ceae6dacbacb3dbff3e459bb9a694085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d011d6ad89d0b033f96c2efbb314d78.png)
(3)如图3,在(2)的条件下,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800d9834f8bf75463e1174722125cfe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594c46cae6cb091e4e064da9077a926f.png)
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解答题-问答题
|
困难
(0.15)
【推荐2】如图1,在四边形
中,如果对角线
和
相交并且相等,那么我们把这样的四边形称为等角线四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/75c7223e-35db-463c-b91d-b338852dd32a.png?resizew=319)
(1)①在“平行四边形、矩形、菱形”中, 一定是等角线四边形(填写图形名称);
②若
、
、
、
分别是等角线四边形
四边
、
、
、
的中点,当对角线
、
还要满足 时,四边形
是正方形.
(2)如图2,已知
中,
,
,
,
为平面内一点.
①若四边形
是等角线四边形,且
,求四边形
的面积;
②设点
是以
为圆心,
为半径的圆上的动点,若四边形
是等角线四边形,则四边形
的面积的最大值为 .
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/75c7223e-35db-463c-b91d-b338852dd32a.png?resizew=319)
(1)①在“平行四边形、矩形、菱形”中, 一定是等角线四边形(填写图形名称);
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389bc3f29c058067e06e0d0d2be399da.png)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
①若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
②设点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
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解答题-证明题
|
困难
(0.15)
【推荐1】探究题
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/67b74df5-e65e-4a58-8066-ba76a9d2515d.png?resizew=520)
(1)知识储备
①如图1,已知点P为等边△ABC外接圆的弧BC上任意一点.求证:PB+PC=PA.
②定义:在△ABC所在平面上存在一点P,使它到三角形三顶点的距离之和最小,则称点P为△ABC的费马点,此时PA+PB+PC的值为△ABC的费马距离.
(2)知识迁移
我们有如下探寻△ABC(其中∠A,∠B,∠C均小于120°)的费马点和费马距离的方法:如图2,在△ABC的外部以BC为边长作等边△BCD及其外接圆,根据(1)的结论,易知线段____的长度即为△ABC的费马距离.
(3)知识应用
①如图3所示的△ABC(其中
均小于
),
,现取一点P,使点P到
三点的距离之和最小,求最小值;
②如图4,若三个村庄
构成Rt△ABC,其中
.现选取一点P打水井,使P点到三个村庄
铺设的输水管总长度最小,画出点P所对应的位置,输水管总长度的最小值为________.(直接写结果)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/67b74df5-e65e-4a58-8066-ba76a9d2515d.png?resizew=520)
(1)知识储备
①如图1,已知点P为等边△ABC外接圆的弧BC上任意一点.求证:PB+PC=PA.
②定义:在△ABC所在平面上存在一点P,使它到三角形三顶点的距离之和最小,则称点P为△ABC的费马点,此时PA+PB+PC的值为△ABC的费马距离.
(2)知识迁移
我们有如下探寻△ABC(其中∠A,∠B,∠C均小于120°)的费马点和费马距离的方法:如图2,在△ABC的外部以BC为边长作等边△BCD及其外接圆,根据(1)的结论,易知线段____的长度即为△ABC的费马距离.
(3)知识应用
①如图3所示的△ABC(其中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ee60666ac6d62d11c3c9400a436e695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47517cbc34ee046702bd73a7f8433279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e30c0a5c92f50dce1f7624709950ff5.png)
②如图4,若三个村庄
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e30c0a5c92f50dce1f7624709950ff5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28ed8d8e301363d1b6f4ea1fe93db9a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e30c0a5c92f50dce1f7624709950ff5.png)
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解答题-问答题
|
困难
(0.15)
【推荐2】对于平面直角坐标系
中的图形
和图形
.给出如下定义:在图形
上存在两点A,B(点A,B可以重合),在图形
上存在两点M,N,(点M、N可以重合)使得
,则称图形
和图形
满足限距关系
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986921767010304/2988849022517248/STEM/7e640f9e-e07b-4594-b1ea-4a9d04c26985.png?resizew=416)
(1)如图1,点
,点P在线段
上运动(点P可以与点C,E重合),连接
.
①线段
的最小值为__________,最大值为__________;线段
的取值范围是__________;
②在点O,点D中,点__________与线段
满足限距关系;
(2)在(1)的条件下,如图2,
的半径为1,线段
与x轴、y轴正半轴分别交于点F,G,且
,若线段
与
满足限距关系,求点F横坐标的取值范围;
(3)
的半径为
,点H,K是
上的两个点,分别以H,K为圆心,2为半径作圆得到
和
,若对于任意点H,K,
和
都满足限距关系,直接写出r的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3ff0b0fea1cb642d3f6be77a1ff32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3ff0b0fea1cb642d3f6be77a1ff32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8021150f6a208a316d31cb8313e42b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3ff0b0fea1cb642d3f6be77a1ff32f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6eaa137a2290a9a9ec7ad635d17dbb6.png)
![](https://img.xkw.com/dksih/QBM/2022/5/25/2986921767010304/2988849022517248/STEM/7e640f9e-e07b-4594-b1ea-4a9d04c26985.png?resizew=416)
(1)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8040fbbe3092651b5333f07cd7b8753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf102743864ca9de02284defb7cc8fb.png)
①线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
②在点O,点D中,点__________与线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
(2)在(1)的条件下,如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12850119b4a552fd2f31178210ba7f9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e1b2d25e575038885c5eddf1ddb229.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f3be3806ce3b7b636535b64c8db3fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9110c10c6b6abeb9021f59dd7852125.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f3be3806ce3b7b636535b64c8db3fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9110c10c6b6abeb9021f59dd7852125.png)
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