如图,在平面直角坐标系xOy中,点A的坐标为(2,0),以线段OA为一边在x轴上方作等边△OAB.C是x轴上一点,连接BC,将线段BC绕点B逆时针旋转60°得到线段BD,连接AD,CD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/d41c19c6-d306-466d-a7de-3aa2523bb3a9.png?resizew=291)
(1)当点C在线段OA的延长线上时.
①求证:
;
②若AD=2AC,求线段CD的的长;
(2)若点E的坐标为
,连接ED,试问线段ED的长是否存在最小值?若存在,请求出该最小值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/d41c19c6-d306-466d-a7de-3aa2523bb3a9.png?resizew=291)
(1)当点C在线段OA的延长线上时.
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2afa1a34e954591ded8e5f6fc11515da.png)
②若AD=2AC,求线段CD的的长;
(2)若点E的坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/310f780f4f03699023b1322a1e002539.png)
更新时间:2022-08-22 21:10:12
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名校
【推荐1】如图1,在
中,
,
,
,
分别为
,
边上一点,连接
,且
,将
绕点
在平面内旋转.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/51605218-ee14-493e-8ada-7ef4af37edb2.png?resizew=613)
(1)观察猜想
若
,将
绕点
旋转到如图2所示的位置,则
的值为______.
(2)类比探究
若
,将
绕点
旋转到如图3所示的位置,求
的值.
(3)拓展应用
若
,
为
的中点,
,当
中,请求出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb2cf0e95fdf1fd8a5b01d3dfd905e08.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e792b0ef3d542237ed0903194597651.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/51605218-ee14-493e-8ada-7ef4af37edb2.png?resizew=613)
(1)观察猜想
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf714ffb3fd5917a76b191640b55fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5516b52e2c32417b3ccf507a75bf5033.png)
(2)类比探究
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5516b52e2c32417b3ccf507a75bf5033.png)
(3)拓展应用
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4151e948feebdf7b91fbe739feafa9bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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【推荐2】综合与实践
特例感知:
如图1,在等边三角形
中,
是
延长线上一点,且
,以
为边作等边三角形
,连接
,交
于点
,过点
作
,过点
作
,交于点
,连接
.
与
之间的数量关系,并说明理由.
猜想论证:
(2)如图2,将
绕点
按顺时针方向旋转一定角度,其余操作不变,则(1)中
与
之间的数量关系是否仍然成立,请说明理由.
拓展延伸:
(3)将如图1所示的
绕点
按逆时针方向旋转
,其余操作不变.若
,当
时,请直接写出
的长.
特例感知:
如图1,在等边三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caedb55e1410c5083c2a8645008527a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10fc7991ea17d54ff5f4445ac5699463.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9de5ff136e64b8556bcee1dffdd84a33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a2612c3ed33135b60b5a08c173c9f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
猜想论证:
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
拓展延伸:
(3)将如图1所示的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5164b6412b7cbb41a3c235d8f4c7588.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9b803099a2a8f3e3235013ae308058e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a64f0bc01c1dbf0b4b87763141d8059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
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【推荐1】如图,
和
都是等边三角形,点
关于
的对称点
在
边上.
①求证:
;
②用等式写出线段
,
,
的数量关系,并说明理由;
(2)如图2,
是直角三角形,
,
,垂足为
,点
关于
的对称点
在
边上.求证:
.
(3)在(2)的条件下,若
,
,直接写出
的值为________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82a6574405000dab3fec93b438aa2de0.png)
②用等式写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c90da0cd2708481057fe19acebf2ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f20ca809dec2caa8b591ef4590fada4e.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97be8206012b8d5b1402dfa5e9761196.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7e75d7342e6f087370d09181b17a4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca181682306cde7908ef6e7bf9fcd00.png)
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【推荐2】在平面直角坐标系中,直线
分别与x轴和y轴交于A、B两点.
(1)如图1,点C是线段AB上的一动点,连结OC,若将线段OC绕点O顺时针旋转90°得到线段OD,求当点C从点B运动到A的过程中,线段OD扫过的面积;
(2)如图2,以点B为圆心2为半径作
,设点C为
上的一动点,连结OC,若将线段OC绕点O顺时针旋转90°得到线段OD,连结BD,求BD长的最大值和最小值,并写出相应点D的坐标;
(3)如图3,线段
,点C是以点F为圆心1为半径的
上的一个动点,连结EC,以EC为边在EF的上方作等边三角形
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/812eed46a589bde8b7c78a81a8cf9b9a.png)
(1)如图1,点C是线段AB上的一动点,连结OC,若将线段OC绕点O顺时针旋转90°得到线段OD,求当点C从点B运动到A的过程中,线段OD扫过的面积;
(2)如图2,以点B为圆心2为半径作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
(3)如图3,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeedb5f361a1baff6338436fff6c471d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989dc4af481c6133824200942b9e5c8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2417861005148160/2417879729971200/STEM/2699952c3d6b41e59d92eba3120e0adb.png?resizew=505)
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【推荐3】问题背景
定义:若两个等腰三角形有公共底边,且两个顶角的和是
,则称这两个三角形是关于这条底边的互补三角形.如图1,四边形
中,
是一条对角线,
,且
,则
与
是关于
的互补三角形.
中,
,D、E为
外两点,
,
为等边三角形.则
关于
的互补三角形是______,并说明理由.
(2)实践应用:如图3,在长方形
中,
.点E在
边上,点F在
边上,若
与
是关于
互补三角形,试求
的长.
(3)思维探究:如图4,在长方形
中,
.点E是线段
上的动点,点P是平面内一点,
与
是关于
的互补三角形,直线
与直线
交于点F.在点E运动过程中,线段
与线段
的长度是否会相等?若相等,请直接写出
的长;若不相等,请说明理由.
定义:若两个等腰三角形有公共底边,且两个顶角的和是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a2d7220744f3ed8e955bee0b6de172.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c00e83a504f7b934d20bf50312afadbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/482af0f0e170a58334ab33bf26c4375a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f30fddaf204f8bb0d5bf718851c6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0005e1ef60f6ddc5f9a83e3de1ef3b2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)实践应用:如图3,在长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ad4f2343d94e45d1c1e7f466b630d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)思维探究:如图4,在长方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03ad4f2343d94e45d1c1e7f466b630d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5fa7dd60b071d132afbfdaf170c1020.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.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/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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【推荐1】在平面直角坐标系中,抛物线
与
轴交于
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/a3622bdc-5401-4f5e-8cdc-65118c4362ee.png?resizew=340)
(1)求抛物线
对应的函数表达式;
(2)如图1,点
为直线
下方抛物线上的一动点,
于点
轴交
于点
.求线段
的最大值和此时点
的坐标;
(3)如图2,将抛物线
沿着
轴向左平移后得到抛物线
,若点
是抛物线
与
在
轴下方的交点且
,求抛物线
对应的函数表达式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38f869c4797de7628c81b3501d124bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2c8df5a6ca516e2ae13bdfb6144132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/17/a3622bdc-5401-4f5e-8cdc-65118c4362ee.png?resizew=340)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
(2)如图1,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba870ac7e456d8daa098c9d52aeccc2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ea5b4a5ad1741b0b26c6e6b06448b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(3)如图2,将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6786da5a6c797abcc51bbe8e60dd815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/172722d11ea7e01411fa06dbb82f46ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a854f7f21e1b4d572bb9a9f5388ce9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fbd49bf20f987c05b4d36e31549075c.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】综合与探究
如图,抛物线
与
轴交于
、
两点,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/2019/4/28/2192045464207360/2192314432659456/STEM/9c293e47446042ddbfaec9363123193d.png?resizew=197)
(1)求抛物线解析式:
(2)抛物线对称轴上存在一点
,连接
、
,当
值最大时,求点H坐标:
(3)若抛物线上存在一点
,
,当
时,求点
坐标:
(4)若点M是
平分线上的一点,点
是平面内一点,若以
、
、
、
为顶点的四边形是矩形,请直接写出点
坐标.
如图,抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b286a72a818ccc52e63581841da08dd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a18a7caa080988802ba1145b4fe4203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2019/4/28/2192045464207360/2192314432659456/STEM/9c293e47446042ddbfaec9363123193d.png?resizew=197)
(1)求抛物线解析式:
(2)抛物线对称轴上存在一点
![](https://img.xkw.com/dksih/QBM/2019/4/28/2192045464207360/2192314432659456/STEM/ca4e72db74b54b34acdbfc4f1b347c55.png?resizew=19)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/400ba978a13bde970c24b0823adbf55d.png)
(3)若抛物线上存在一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a916811b6ae474bce19ce732cf401e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4cc16dafb7a7f5aae14ce49d6bbdcc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(4)若点M是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次
【推荐1】对于平面直角坐标系xOy中的图形P,Q,给出如下定义:M为图形P上任意一点,N为图形Q上任意一点,如果M,N两点间的距离有最小值,那么称这个最小值为图形P,Q间的“非常距离”,记作
.已知点
,
,连接AB.
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992554641645568/2994662731874304/STEM/35c3d024-9fe0-45bd-bc26-c1ea2970a098.png?resizew=257)
(1)d(点O,AB)= ;
(2)⊙O半径为r,若
,直接写出r的取值范围;
(3)⊙O半径为r,若将点A绕点B逆时针旋转
,得到点
.
①当
时
,求出此时r的值;
②对于取定的r值,若存在两个α使
,直接写出r的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32286c3865f06865920816e7685c497a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bdfc750fe0ace842a461e89f2b7b290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baca988e757625c577e02752422a72d.png)
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992554641645568/2994662731874304/STEM/35c3d024-9fe0-45bd-bc26-c1ea2970a098.png?resizew=257)
(1)d(点O,AB)= ;
(2)⊙O半径为r,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a335cd31742ea18cfd2a1d6722ecef5e.png)
(3)⊙O半径为r,若将点A绕点B逆时针旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd3900b1a2394b0b69d9ce5a6d01e1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e553850a06ccbb33ca07515ddd21eb57.png)
②对于取定的r值,若存在两个α使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e553850a06ccbb33ca07515ddd21eb57.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】婆罗摩笈多(Brahmagupta)约公元598年生,约660年卒,在数学、天文学方面有所成就. 婆罗摩笈多是印度印多尔北部乌贾因地方人,原籍可能为巴基斯坦的信德. 婆罗摩笈多的一些数学成就在世界数学史上有较高的地位. 例如下列模型就被称为“婆罗摩笈多模型”:如图1,2,3,△ABC中,分别以AB,AC为边作Rt△ABE和Rt△ACD,AB=AE,AC=AD,∠BAE=∠CAD=90°,则有下列结论:
①图1中S△ABC=S△ADE;
②如图2中,若AM是边BC上的中线,则ED=2AM;
③如图3中,若AM⊥BC,则MA的延长线平分ED于点N.
(1)上述三个结论中请你选择一个感兴趣的结论进行证明,写出证明过程;
(2)能力拓展:将上述图形中的某一个直角三角形旋转到如图4所示的位置:△ABC与△ADE均为等腰直角三角形,∠BAC=∠DAE=90°,连接BD,CE,若F为BD的中点,连接AF,求证:2AF=CE.
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853282304155648/2855534567964672/STEM/5026df9f-aaea-4478-8b1c-0c0f1c0b2370.png)
①图1中S△ABC=S△ADE;
②如图2中,若AM是边BC上的中线,则ED=2AM;
③如图3中,若AM⊥BC,则MA的延长线平分ED于点N.
(1)上述三个结论中请你选择一个感兴趣的结论进行证明,写出证明过程;
(2)能力拓展:将上述图形中的某一个直角三角形旋转到如图4所示的位置:△ABC与△ADE均为等腰直角三角形,∠BAC=∠DAE=90°,连接BD,CE,若F为BD的中点,连接AF,求证:2AF=CE.
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853282304155648/2855534567964672/STEM/5026df9f-aaea-4478-8b1c-0c0f1c0b2370.png)
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853282304155648/2855534567964672/STEM/559555c1-2089-441f-9406-b8c9a882ad4b.png?resizew=166)
您最近一年使用:0次