如图,中,点
分别在
边上,连接
.
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70aac14b25db8cf6f179fad77485cc4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b39cdf992c2866d7eea2e0b02d19b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8faa28ca941a165fcbf175a03f5bcec2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cf2f07337ae081702daa9e9eec893cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d86ef7871e74d2404747daf25641ba2.png)
(3)如图3,在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea64fafe32635ee1daae2a00c93f3640.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a4540ef195c8354e8cb4de69dfcde93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/914a95480b73923bfd17c6b34a5d6ddb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
更新时间:2024-02-19 21:42:27
|
相似题推荐
解答题-作图题
|
困难
(0.15)
【推荐1】【概念认识】若以三角形某边上任意一点为圆心作半圆,所作的半圆上的所有点都在该三角形的内部或边上,则将符合条件且半径最大的半圆称为该边关联的“极限内半圆”.
【特例感知】如图1,
中,
,点P是边
上一点,以P为圆心的半圆上的所有点都在
的内部或边上,当半径最大时,半圆P为边
关联的“极限内半圆”.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/43f57359-f64e-493f-908c-2eab9b4b550c.png?resizew=531)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/5b05e8b9-c6a3-4c53-9785-0c9b0a103954.png?resizew=275)
请尝试解决下面3个问题:
(1)如图1,边
关联的“极限内半圆”半圆P与边
的位置关系是____________.
(2)在(1)的条件下,若
,则边
关联的“极限内半圆”半圆P的半径是______.
(3)如图2,在钝角
中,用直尺和圆规作出边
关联的“极限内半圆”(保留作图痕迹,不写作法);
(4)【迁移思考】小军发现,任意三角形的三条边上都可以作出与边关联的“极限内半圆”,但大小未必一样,请你帮助小军解决下面的问题:如图3,锐角
中,边
的长分别是
,
的面积为S,求出
中最小“极限内半圆”的半径;(用
中的一个或几个字母来表示);
(5)【灵活运用】如图4,
是锐角,且
,点A在射线
上,
,点B是射线
上一动点.在
中,若边
关联的“极限内半圆”的半径为r,当
时,求
的长的取值范围.
【特例感知】如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/43f57359-f64e-493f-908c-2eab9b4b550c.png?resizew=531)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/5b05e8b9-c6a3-4c53-9785-0c9b0a103954.png?resizew=275)
请尝试解决下面3个问题:
(1)如图1,边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cdba2ac1a72eea482f5578843e00357.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2c1f7881958a75617212620f3e02add.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)如图2,在钝角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(4)【迁移思考】小军发现,任意三角形的三条边上都可以作出与边关联的“极限内半圆”,但大小未必一样,请你帮助小军解决下面的问题:如图3,锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee14312eec42c729aab9880e09d3726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31e2bbf8f4e35f0edad1f2a476656b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/656fc6baa17b333b5a83eefc3ed3bcdb.png)
(5)【灵活运用】如图4,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27935c1ef4df2d52ac697678a3c8f39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2e8d8789daf57f154ea96e4d5df0ae1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f561a36cc4c9293d8a63ee4e1a7146b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb69297963de72ea13c71fb9172fe02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
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【推荐2】如图,在平面直角坐标系中,二次函数
的图象与x轴分别交于点O、A,顶点为B,连接
.点D在线段
上,作射线
,过点A作
射线
,垂足为点E,以点A为旋转中心把
按逆时针方向旋转
到
,连接
.
(2)随着点D在线段
上运动.
①连接
,
的大小是否发生变化?请说明理由;
②延长
交
于点P,线段
的长度是否存在最大值?若存在,求出最大值;若不存在,请说明理由;
(3)连接
,当点F在该抛物线的对称轴上时,
的面积为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/486b96b4a781baa50ad66064b2190534.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d891ebcb02990983cc38f924295492c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4c3f9dd5d0343597a7f58a1989b537.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)随着点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f8bd15abf37c18dfaecf354b4103bf.png)
②延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
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【推荐3】【课本探究】如图1所示,将两个含30°角的三角尺摆放在一起,可以证得△ABD是等边三角形,于是我们得到:在直角三角形中,如果一个锐角等于30°,那么它所对的直角边等于斜边的一半.
【小试牛刀】 如图2,在
中,
,AD平分
,
,则BC= .
【变式探索】如图3,菱形ABCD的边长为6,
,点P是对角线AC上一点(不与端点A重合),则
的最小值为 .
【能力提升】如图4,在四边形ABCD中,
,
,以C为圆心、5为半径作圆弧,分别交CD、CB于点E、F,点P是
上的一动点,过点P作
射线AD于点N、交射线AB于点M,在点P的运动过程中线段MN是否存在最小值?如果存在,请求出这个最小值;若不存在,请说明理由.
【拓展应用】
如图5,四边形ABCD是某区的一处景观示意图,
,
,M是AB上一点,且
m.按设计师要求,需在四边形区域内确定一个点N,修建花坛
和草坪
,且需
m.已知花坛的造价是每平米200元,草坪的造价是每平米100元,请帮设计师算算修好花坛和草坪预算最少需要多少元?(结果保留根号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/a94ac87f-c5b8-4487-94c7-f53a80dd58c5.png?resizew=540)
【小试牛刀】 如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eb25819587ec72d4b6370e70cd94103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
【变式探索】如图3,菱形ABCD的边长为6,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ca3490519bd9e7301ac70b82d4bfe8d.png)
【能力提升】如图4,在四边形ABCD中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56af6f4f27214b92b6467d76fe2dd56b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e124a392dc84fcc1662fe6d896aa12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93cf663ee2bf1ac5c43f4306fa0cf250.png)
【拓展应用】
如图5,四边形ABCD是某区的一处景观示意图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8bd50d47fda52029c623d2841515f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d084850e8e15a93cb84605c8168ac409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbb12ea3cc86c6d177447ec2a222ffd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1275768bdac801185ef152290a85ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/774a81db03ec4629740ab5cb1d6c6f52.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/9/a94ac87f-c5b8-4487-94c7-f53a80dd58c5.png?resizew=540)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/f6848371-0c96-4462-9254-7a5014f7fe36.png?resizew=462)
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解答题-证明题
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困难
(0.15)
【推荐1】问题提出
已知
是等边三角形,将等边三角形
(
,
,
三点按逆时针排列)绕顶点
旋转,且平移线段
使点
与顶点
重合,得到线段
,连接
,
,
.
观察发现
(1)如图1,当点
在线段
上,猜想
的形状 ;
探究迁移
(2)如图2,当点
不在线段
上,(1)中猜想的结论是否依然成立,请说明理由;
拓展应用
(3)若
,
,在
绕着点
旋转的过程中,当
时,求线段
的长.
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
观察发现
(1)如图1,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/5f2ea13010e2399194be2a681310543e.png)
探究迁移
(2)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
拓展应用
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85516a42c9d69ac43e28caef35f14bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/8f369839-2471-438c-8450-1a21bc5e18bf.jpg?resizew=281)
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名校
【推荐2】问题发现.【发现】如图
,已知等边
,将直角三角板的
角顶点
任意放在
边上
点
不与点
、
重合
,使两边分别交线段
、
于点
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/4253e8e1-bce6-48b9-8ef1-24e185508ad9.png?resizew=586)
(1)若
,
,
,则
______;
(2)求证:
∽
.
(3)【思考】若将图
中的三角板的顶点
在
边上移动,保持三角板与边
、
的两个交点
、
都存在,连接
,如图
所示,问:点
是否存在某一位置,使
平分
且
平分
?若存在,求出
的值;若不存在,请说明理由.
(4)【探索】如图
,在等腰
中,
,点
为
边的中点,将三角形透明纸板的一个顶点放在点
处
其中
,使两条边分别交边
、
于点
、
点
、
均不与
的顶点重合
,连接
设
,则
与
的周长之比为______
用含
的表达式表示
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad1b0a76a887783392268ae203ad22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/16/4253e8e1-bce6-48b9-8ef1-24e185508ad9.png?resizew=586)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377f5c10cf527c87ab06bff61384f7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebab559439450db104590396f6139eac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f48208a3f67fd590d973badcc742d4b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460c3a0db006e19ad307953dc8b0e233.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d56642be8aeb524e40953e03034919ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f58345b1a681cd44f425b24887b6dd1c.png)
(3)【思考】若将图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1c9ae241fd78126274c65e17990c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.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/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c650fe55b7603f106c53ca2423451c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8946331b0a9d86e1a9c78797f3021455.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c89f4ddd6e6fbeb21b957b78bc21118e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faee0268e5ede6318697e5a8509dd6f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e19a4abeafe4d07e7135e67a74363893.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d1067bb0490bc01d2646ee21b4abe5.png)
(4)【探索】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f82e415812cca9545611c0faa0c01b1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/749111bf878f66ccc6e4eafd2c78cfdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9574e2c8e8bc7d5320dbafbb0af27ab.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/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad302f81310e80de6f5c8906aab84d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe41cba3003938160f501525f2a7311b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15347d7870120325031b981affdac48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d71379442f28c038d367d49422cf90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐1】在
中,
.
, 以
为边在
下方作等边,
,
与
交于点O,连接
,求四边形
的面积;
(2)如图2,若
,以
为边在
下方作等边
,连接
,过点A作
于点E,求证∶
;
(3)如图3,若
,在
下方作等腰
,过点F作
交
延长线于点G,T为
中点,M为
延长线上一点,将
绕点F顺时针旋转至
,旋转角为
,连接
,
,
,
,
,当
最小时,直接写出
的面积.
![](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/54fe77c7a930d382858d34a687a29913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/520f8abda6a85e7ef6f281fc2df853fa.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caadaca1d55a032cea72224c800f6072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1407e6138439ad39d0f8ebe31f7263a1.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/702f3bab242d53b8fbcb9fde925953b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be73a932ff74399eafef014055ee9f12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93007c1e531d19ea36757954b9fb7772.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a477603f3f88c3b48352b6130f9ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3233dbbd70b3c7ab56450a7a0971e951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b40aa8d2482d698ebef69cf225f99f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35ee685a6d4799b0ba7e114a3906c0c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfb2c723886efd3f7a016281fa01ff5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb2787c09a6dd07ba5ab7af7f2856711.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0cee0f36dc452e58086832c0152b641.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56aa199e4aefa12102f57c4b3f1a9070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed11fc0bb3a04d0f10a3a7363fe635cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a96cb598904312b0dd2e8996e18797ca.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
为线段
上任一点,
为
中点,分别以
为边向
同侧作等边三角形
和等边三角形
,点
分别为
的中点,连
.
点在
上运动时,
①求证:
;
②求
的大小.
(2)若
,
,则直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4515e1dff9a852b3294dc1d6488a5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/500df0e782bb081e608f4bc1d576afcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f44755c5fee4b90266eac73ad47a128.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311575bd0247cf5d99ff41c5debab4dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c3eb893dbdf8ae2f3ea912ada77f7cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e2fc995a2540e15b83902554bdd1dd1.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07505530a9ec2f9c8a23e3c9eafa313.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐1】如图,抛物线
与x轴交于两点
和
,与y轴交于点C,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/64ebc34b-b9ea-4cc3-bfe5-2fa18163e7a7.png?resizew=400)
(1)求抛物线的解析式;
(2)N是抛物线对称轴上一点,当三角形
为等腰三角形时,求N点的坐标.
(3)点D是
边上一点,连接
,将线段
以O为旋转中心,逆时针旋转
,得到线段
,若点E落在抛物线上,求出此时点E的坐标;
(4)点M在线段
上(与A,B不重合),点N在线段
上(与B,C不重合),是否存在以C,M,N为顶点的三角形与
相似,若存在,请直接写出点N的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a0d44326c214c7a5ecc3068a29ec96f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ff2dba976c68740bbff0d1dda6a870c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f0e78c2a6a6736652c0246e2af6177.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6d50515fc65885d44cd6a3c41e6a7e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/21/64ebc34b-b9ea-4cc3-bfe5-2fa18163e7a7.png?resizew=400)
(1)求抛物线的解析式;
(2)N是抛物线对称轴上一点,当三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/335187895f612ce811414cfbedf89467.png)
(3)点D是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
(4)点M在线段
![](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/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图1,在边长为1的正方形
中,E是
上的动点,连接
,点F在线段
上,连接
.点G是
的中点,以
,
为邻边构造
,其中
,
分别交
于点M,N.
(1)求
的长.
(2)当点F为
的中点时,求
的值.
(3)如图2,已知点F满足
.
①若
的面积等于四边形
的面积,求
的值.
②当
的一边所在的直线恰好经过正方形
的顶点B或C时,求
的值.
![](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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f76aad23d4a1801940e85845fecce88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/27/f2ff2f79-25aa-43fb-9e71-5734b7bb1463.png?resizew=320)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
(2)当点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ffac199179984ab3868ab048955958de.png)
(3)如图2,已知点F满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27bf83600bed781e0c73071cea3fdf2b.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36e5e61804ce550636a0354e0a78a22d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f61e059c6d342c2ca744cdf8cac2369e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e68cdc2ed4b012b8e5d775f412a43b5.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/928a7cee6ead3ff401e830a2f27b7bad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次