在锐角△ABC中,AB=AC,D是线段BC上的一点,连接AD,将AD绕着点A顺时针旋转至AE,使得∠EAD=2∠BAC,连接DE交AB于点F.
![](https://img.xkw.com/dksih/QBM/2021/11/18/2853710348279808/2855943578214400/STEM/ddff16b1b329447b972e7b6d55e95331.png?resizew=532)
(1)如图1,若∠BAC=60°,∠DAC=15°,BD=4,求AB的长;
(2)如图2,点G是线段AC的一点,连接DG,FG,若DA平分∠EDG,求证:FE=DG+FG;
(3)在(1)的条件下,将△BFD绕D点顺时针旋转∠α(0°<α<180°)得△B'F'D,直线B'F'交AB于点M,交AC于点N.在旋转过程中,是否存在△AMN为直角三角形?若存在,请直接写出AM的长度;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/11/18/2853710348279808/2855943578214400/STEM/ddff16b1b329447b972e7b6d55e95331.png?resizew=532)
(1)如图1,若∠BAC=60°,∠DAC=15°,BD=4,求AB的长;
(2)如图2,点G是线段AC的一点,连接DG,FG,若DA平分∠EDG,求证:FE=DG+FG;
(3)在(1)的条件下,将△BFD绕D点顺时针旋转∠α(0°<α<180°)得△B'F'D,直线B'F'交AB于点M,交AC于点N.在旋转过程中,是否存在△AMN为直角三角形?若存在,请直接写出AM的长度;若不存在,请说明理由.
21-22八年级上·重庆·期中 查看更多[2]
重庆市重庆实验外国语学校2021-2022学年八年级上学期期中数学试题(已下线)第07课 特殊平行四边形 解答题(难点2-存在性问题)-2022-2023学年九年级数学上册课后培优分级练(北师大版)
更新时间:2021-11-21 10:14:59
|
相似题推荐
解答题-问答题
|
困难
(0.15)
名校
解题方法
【推荐1】现有与菱形有关的三幅图,如下:
![](https://img.xkw.com/dksih/QBM/2020/10/8/2566480460996608/2566651721777152/STEM/bb63a948-0455-44da-923b-e2f0d0f94b7e.png?resizew=544)
(1)(感知)如图①,
是菱形
的对角线,
分别是边
上的中点,连结
,若
,则
的长为______
(2)(探究)如图②,在菱形
中,
是边
上的点,连结
,作
,边
交边
于点
,连结
.若
,求
的长.
(3)(应用)在菱形
中,
是边
上的点,连结
,作
,边
交边
于点
,连结
.若
,
时,借助图③求
的周长.
![](https://img.xkw.com/dksih/QBM/2020/10/8/2566480460996608/2566651721777152/STEM/bb63a948-0455-44da-923b-e2f0d0f94b7e.png?resizew=544)
(1)(感知)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb176f57961dd5755bbf0823d97722a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50eb6d12aa7f0922aabf1a26f8eddbfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac175010746fd4c90a55cb9081a1ffb6.png)
(2)(探究)如图②,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c46a1e9d91103f6ff6c2bfbfba35024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac175010746fd4c90a55cb9081a1ffb6.png)
(3)(应用)在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c46a1e9d91103f6ff6c2bfbfba35024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f201a40fedca4ad14db193f4db2127e.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
【推荐2】如图,点
的坐标为
,
轴,垂足为
,
轴,垂足为
,点
分别是射线
、
上的动点,且点
不与点
、
重合,
.
![](https://img.xkw.com/dksih/QBM/2020/1/30/2388339004588032/2389673387483136/STEM/f48efbde7be8476482fdeb0d59c7210e.png?resizew=310)
(1)如图1,当点
在线段
上时,求
的周长;
(2)如图2,当点
在线段
的延长线上时,设
的面积为
,
的面积为
,请猜想
与
之间的等量关系,并证明你的猜想.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b97223d7e2a154dfcf9568f1144beb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24624dffd30b66a5e4de57362b32b2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5862fb8bb359e111a5896f1389ac1126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21bcb4db585d46f4e9a6fde61af667e8.png)
![](https://img.xkw.com/dksih/QBM/2020/1/30/2388339004588032/2389673387483136/STEM/f48efbde7be8476482fdeb0d59c7210e.png?resizew=310)
(1)如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011dd98c33eb2c7b7162c410f3984467.png)
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f460edcced5597615113c0fdc95b1dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011dd98c33eb2c7b7162c410f3984467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】在平面直角坐标系中,点O为坐标原点,直线
与x轴的正半轴相交于点A,与y轴的正半轴相交于点B,直线
于点C,
,点B坐标为
.
的解析式;
(2)如图2,点D在线段
上,作
于点F,点E在线段
上,连接
,且
,点N在线段
上,连接
并延长到点Q,使
,
交
于点R,求
的值;
(3)如图3.在(2)的条件下,若点N为
中点,连接
,
,取
的中点H,连接
,点K在
的延长线上,连接
,作
交
的延长线于点P,连接
,若
,且
,求点K的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/771b610e4ddefa739a985d1e5462ce5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb5491be33e34f24a3be34f9ae09078a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c49350d67653f4fad39dcadec2460c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)如图2,点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb73d10046e64d6f36e2dfdc9b9e6145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/649c69477130e4b3b6eb31b52aed3066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392ed80d2fc48a3082780e31b0c01e23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7d2e34956b99380485ea75486321eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0791b60760ff08c9e7bc7317f231f06e.png)
(3)如图3.在(2)的条件下,若点N为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97223e7c3ff2c78bdedae87a8ba66112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e739238788da249ea268c3ea900f1827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52f1ad30f60211e40e40ddfaef59e9c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a8789679dcd8db0ed928590200184b.png)
您最近一年使用:0次
【推荐2】在平面直角坐标系中,已知点
,线段
轴于A点,线段
轴于C点,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc150998a4805bbb5333331ae92ea219.png)
.
(1)求A,B,C三点的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/f9140a34-ee3d-45b9-843b-e4ccc6c13c31.png?resizew=147)
(2)若点D是BC的中点,点E是线段OD上一动点,记点E的横坐标为m,请用含m的代数式表示△
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/09285942-f365-4e88-952f-a353c345eec1.png?resizew=147)
(3)在(2)的条件下,当点E运动到OD的中点处时,请在y轴上确定一点P,使得
为等腰三角形,直接写出P点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c608365fb066f4a93301433b445330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2485101d50dd5eef3e4fb242adfca527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05b45db8dd8768994af51206565379fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc150998a4805bbb5333331ae92ea219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a74bf10927828511430b9f8d37c2ccc2.png)
(1)求A,B,C三点的坐标.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/f9140a34-ee3d-45b9-843b-e4ccc6c13c31.png?resizew=147)
(2)若点D是BC的中点,点E是线段OD上一动点,记点E的横坐标为m,请用含m的代数式表示△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/09285942-f365-4e88-952f-a353c345eec1.png?resizew=147)
(3)在(2)的条件下,当点E运动到OD的中点处时,请在y轴上确定一点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099dd87a526391f830ac2a11e7d7ad56.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/19/afb1dd34-2182-46e6-bdbe-ee02491dc615.png?resizew=147)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】如图①、②、③是两个半径都等于2的
和
,由重合状态沿水平方向运动到互相外切过程中的三个位置,
和
相交于A、
两点,分别连接
、
、
、
和
.
(1)如图②,当
时,求两圆重叠部分图形的周长
;
(2)设
的度数为
,两圆重叠部分图形的周长为
,求
关于
的函数关系式,并写出自变量
的取值范围;
(3)在(2)中,当重叠部分图形的周长
时,则线段
所在的直线与
有何位置关系?请说明理由.除此之外,它们是否还有其它的位置关系?如果有,请直接写出其它位置关系时的
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cd73875650e1538c4c61d5e16d3db29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d817b898a4106c0fc24edee630a9eed9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca1d1079fc3ac3e8d44159329865cb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d85623f82c7d166bc6ae6b403cb5b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a5e3927b043383fcec844833d3f093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)如图②,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6177efbe56f9b8be0f41e52f5d2f14bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3fbcc83500a87910be63e9faf03ab4.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)在(2)中,当重叠部分图形的周长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ab1ee5bff40c30509750e578681e41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d85623f82c7d166bc6ae6b403cb5b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0385df6c7f8ee7ab503b6ed35933695b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2013/5/20/1573653943967744/1573653949562880/STEM/b4a09dc3c7ad42c495560feec9bbe985.png?resizew=434)
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解答题-证明题
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【推荐2】在平行四边形ABCD中,点E、F分别在边AB、BC上,DE、AF交于点M.
(1)如图1,E为AB的中点,AF⊥BC交BC于点F,过点E作EN⊥AF交AF于点N,
,直接写出
的值是 ;
(2)如图2,∠B=90°,∠ADE=∠BAF,求证:△AEM∽△AFB;
(3)如图3,∠B=60°,AB=AD,∠ADE=∠BAF,求证:
.
(1)如图1,E为AB的中点,AF⊥BC交BC于点F,过点E作EN⊥AF交AF于点N,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b08fa7254a35e88e10e062ce8276a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97dcaa7b2cd8bd3e75072cad71531c03.png)
(2)如图2,∠B=90°,∠ADE=∠BAF,求证:△AEM∽△AFB;
(3)如图3,∠B=60°,AB=AD,∠ADE=∠BAF,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5448896cfe896ccbe03d630385c9c1.png)
![](https://img.xkw.com/dksih/QBM/2020/6/5/2477874625495040/2478883877421056/STEM/668919a2c9fe4bc6b7e1c2a753484f19.png?resizew=457)
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解答题-作图题
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困难
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【推荐1】实验探究:如图,
ABC和
ADE是有公共顶点的等腰直角三角形,∠BAC=∠DAE=90°,BD、CE延长线交于点P.
![](https://img.xkw.com/dksih/QBM/2022/4/17/2960202580516864/2960924606013440/STEM/2266401e-b1b3-4ba0-82dd-a04e7b4833f1.png?resizew=622)
(1)【问题发现】把
ABC绕点A旋转到图1,BD、CE的关系是 (相等或不相等),直接写出答案;
(2)【类比探究】若AB=3,AD=5,把
ABC绕点A旋转,当∠EAC=90°时,在图中作出旋转后的图形,并求出此时PD的长;
(3)【拓展延伸】在(2)的条件下,请直接写出旋转过程中线段PD的最小值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2022/4/17/2960202580516864/2960924606013440/STEM/2266401e-b1b3-4ba0-82dd-a04e7b4833f1.png?resizew=622)
(1)【问题发现】把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)【类比探究】若AB=3,AD=5,把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(3)【拓展延伸】在(2)的条件下,请直接写出旋转过程中线段PD的最小值为 .
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解答题-问答题
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【推荐2】对图形M,N和点P,如果图形M上存在点Q1,图形N上存在点Q2,使得点Q1绕点P顺时针旋转90°后与点Q2重合,则称图形N是图形M关于点P的“秋实”图形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/01794f54-6ee8-428d-98cb-26f846c8c131.png?resizew=550)
(1)如图1,A(﹣3,0),B(0,3),则点C1(1,0),C2(﹣2,﹣1),C3(3,0)中.是线段AB关于坐标原点O的“秋实”图形的点是 ;
(2)设直线y=x+b(b>0)与x轴负半轴交于点D,与y轴正半轴交于点E,⊙F是以点F(2,1)为圆心,2为半径的圆.若⊙F是线段DE关于坐标原点O的“秋实”图形,求b的取值范围;
(3)设直线l:y=k(x+m),其中m>0,⊙G是以G(4,0)为圆心,1为半径的圆,若对⊙G上的任意一点H,存在k(
≤k≤
),使得点H是直线l关于坐标原点O的“秋实”图形,请直接写出m的取值范围.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/4/01794f54-6ee8-428d-98cb-26f846c8c131.png?resizew=550)
(1)如图1,A(﹣3,0),B(0,3),则点C1(1,0),C2(﹣2,﹣1),C3(3,0)中.是线段AB关于坐标原点O的“秋实”图形的点是 ;
(2)设直线y=x+b(b>0)与x轴负半轴交于点D,与y轴正半轴交于点E,⊙F是以点F(2,1)为圆心,2为半径的圆.若⊙F是线段DE关于坐标原点O的“秋实”图形,求b的取值范围;
(3)设直线l:y=k(x+m),其中m>0,⊙G是以G(4,0)为圆心,1为半径的圆,若对⊙G上的任意一点H,存在k(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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