素材1:平面内,由不在同一直线上的四条线段首尾顺次相接围成的封闭图形称为四边形,其中作出一条边所在的直线,其余各边均在其同侧的四边形称为凸四边形,其余各边中有不在同侧的四边形称为凹四边形,换句话说就是,凸四边形的每个内角都小于![]() ![]() 素材2:我们把一组对角相等且只有一组对边相等的凸四边形称为F−四边形.小亮按下列步骤操作得到的四边形ABDE就是F−四边形: 第1步:画 ![]() ![]() ![]() 第2步:在边 ![]() ![]() 第3步;以D为圆心, ![]() ![]() 第4步:连结 ![]() ![]()
|
活动一:素材反思 |
思考1:素材2中操作的第2步中为什么要说明“![]() 任务1:在 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() |
思考2:素材2中操作的第1步中为什么要说明“![]() 任务2:在 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]()
|
活动二:图形应用 |
如图,四边形![]() ![]() ![]() ![]() ![]() 任务3:记 ![]() |
|
更新时间:2024-05-26 23:29:43
|
相似题推荐
【推荐1】若任意一个代数式,在给定的范围内求得的最值恰好也在该范围内,则称这个代数式是这个范围的“友好代数式”.例如:关于
的代数式
,当
时,代数式
在
时有最大值,最大值为1;在
时有最小值,最小值为0,此时最值1,0均在
(含端点)这个范围内,则称代数式
是
的“友好代数式”.
(1)若关于
的代数式
,当
时,取得的最大值为________;最小值为________;代数式
________(填“是”或“不是”)
的“友好代数式”;
(2)以下关于
的代数式,是
的“友好代数式”的是________;
①
;②
;③
;
(3)若关于
的代数式
是
的“友好代数式”,则
的值是________;
(4)若关于
的代数式
是
的“友好代数式”,求
的最大值和最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6343069217cd6d8dd32446da428dae46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54faa979e57d1ed35655f31c59241a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb45f673c56a289ea78831c9237e8d20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e215900760ed416c522dcad0e481b7ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6343069217cd6d8dd32446da428dae46.png)
(1)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d99d2f9daf80dfcf2e6c27672d1797d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d99d2f9daf80dfcf2e6c27672d1797d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
(2)以下关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd9be51fac59ed0ac89031374d29cc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60e734832ff181d4ca0bf99ebbd51684.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6f1b2075066b69fa81e9f61b1e9b56.png)
(3)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92713ec27350719ad630f773410ef438.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f52db3046e7c92b3a7fdd6c34657663.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(4)若关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc464997862ffe7bc650c2ae13d62902.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b6fd5a1dbb65cbe9bfe602c914a24f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
真题
【推荐2】在平面直角坐标系
中,对于A、
两点,若在y轴上存在点T,使得
,且
,则称A、
两点互相关联,把其中一个点叫做另一个点的关联点.已知点
、
,点
在一次函数
的图像上.
(1)①如图,在点
、
、
中,点M的关联点是_______(填“B”、“C”或“D”);
②若在线段
上存在点
的关联点
,则点
的坐标是_______;
(2)若在线段
上存在点Q的关联点
,求实数m的取值范围;
(3)分别以点
、Q为圆心,1为半径作
、
.若对
上的任意一点G,在
上总存在点
,使得G、
两点互相关联,请直接写出点Q的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10a07d35d96c004bc320cd4050a31649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94c6588ab8dbb23df09e52ce8686bbc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8547f2b4e89b0ae1445bda02d46f0668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d8350efd6636002f417d721fc87a126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5209cf3b0c9a91e93f73aa93cab13d18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81041b4dd93923454a8f69da30d53249.png)
(1)①如图,在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c850811ba59a05e945a665196539a048.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b64196fcc78c3d4e076339b262ad91dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6d938bb311b462ad16381bcf3b7e69.png)
②若在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c9708ef0dc6d6f5dcf6596d3e4f6e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
(2)若在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a42da28be159399514cc6179a96e34b.png)
(3)分别以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708011e87fae90efc444a7477512aac0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d5ab74296abcbcf994c02b5834cd699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb52bba9798c625c7cd778636bceea32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81722445de00f3cfcc3cb97e45b0d8dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81722445de00f3cfcc3cb97e45b0d8dd.png)
![](https://img.xkw.com/dksih/QBM/2021/7/3/2756432937345024/2756441517498368/STEM/3e1ab954-39c7-4060-961d-5df6eb309d08.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,在平面直角坐标系xOy中,抛物线
过点
,
,这条抛物线的对称轴与x轴交于点C,点P为射线CB上一个动点(不与点C重合),点D为此抛物线对称轴上一点,且CPD=
.
(1)求抛物线的函数表达式;
(2)若点P的横坐标为m,△PCD的面积为S,求S与m之间的函数关系式;
(3)过点P作PE⊥DP,连接DE,F为DE的中点,试求线段BF的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d103c1e0b6d9f0f9568d7d302b10ef3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c6ff81aedbefa935da289dc632e78eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2b9ee165fff07f902ab60ee54fcb1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
(1)求抛物线的函数表达式;
(2)若点P的横坐标为m,△PCD的面积为S,求S与m之间的函数关系式;
(3)过点P作PE⊥DP,连接DE,F为DE的中点,试求线段BF的最小值.
![](https://img.xkw.com/dksih/QBM/2019/4/26/2190852779909120/2192024349310976/STEM/5916f7566c394ae5bd5b42a59881d139.png?resizew=217)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
解题方法
【推荐2】已知,
内弦
、
交于点E,
,连接
.
(1)如图1,求证:
平分
;
(2)如图2,连接
交
于点G,延长
交
于点F,连接
,若
,求证:
;
(3)如图3,在(2)的条件下,延长
交
于点H,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/23/084e0acf-f2ac-4dba-aef6-1771e121f792.png?resizew=428)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3de20ba8bda63c650ef571be155702.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86e5888c98e8e9e59ded39e5a61097c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf79b050df52274a0ad72baee610172f.png)
(3)如图3,在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af008afff98efa3b081aa97c173566c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbf7aab0f06807762d312445c607f615.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.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△ABC中,AB=AC,∠BAC=α,D为平面内一点,且AD<AB,以A点为中心,将线段AD逆时针旋转180°-α,得到线段AE.
(1)如图1,当D点在线段BC上时,恰有AE∥BC,连接DE交AC于F点,求证:F为线段DE中点;
(2)连接BE、CD,取BE中点G,连接AG.
①如图2,当D点在△ABC内部时,用等式表示线段AG与CD之间的数量关系,并证明;
②令α=90°,若当A、D、G三点共线时,恰有∠AGB=120°,直接写出此时
的值.
(1)如图1,当D点在线段BC上时,恰有AE∥BC,连接DE交AC于F点,求证:F为线段DE中点;
(2)连接BE、CD,取BE中点G,连接AG.
①如图2,当D点在△ABC内部时,用等式表示线段AG与CD之间的数量关系,并证明;
②令α=90°,若当A、D、G三点共线时,恰有∠AGB=120°,直接写出此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/388babe1c3b49bca41e5aa6cf72adc5c.png)
![](https://img.xkw.com/dksih/QBM/2021/11/8/2847133274046464/2848131555901440/STEM/cb8631f42dc04e28aae8aadac3cc6044.png?resizew=554)
您最近一年使用:0次
解答题-证明题
|
困难
(0.15)
名校
【推荐2】我们知道,三角形的中位线平行于三角形的第三边,并且等于第三边的一半,如何证明三角形中位线定理呢?
(1)【方法回顾】证明:三角形中位线定理.
已知:如图,在
中,
、
分别是
、
的中点.
求证:
,
.
证明三角形中位线性质定理的方法很多,但多数都需要通过添加辅助线构图去完成,下面是其中一种证法的添加辅助线方法,阅读并完成填空:
添加辅助线,如图1,在
中,过点
作
,与
的延长线交于点
.可证
______,根据全等三角形对应边相等可得
,然后判断出四边形
是______,根据图形性质可证得
,
.
(2)【方法迁移】如图2,在四边形
中,
,
,
,
为
的中点,
、
分别为
、
边上的点,若
,
,
,求
的长.
(3)【定理应用】如图3,在
中,
,
是
的中点,
是边
上一点,
,延长
至点
,使
,延长
交
于点
,直接写出
的值(用含
的式子表示).
(1)【方法回顾】证明:三角形中位线定理.
已知:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/60ef95894ceebaf236170e8832dcf7e3.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/83dd4fe3-36f7-4435-9765-7319b99cff7d.png?resizew=150)
证明三角形中位线性质定理的方法很多,但多数都需要通过添加辅助线构图去完成,下面是其中一种证法的添加辅助线方法,阅读并完成填空:
添加辅助线,如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe9f641563e8533a5bb39188aa7cc182.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2f359d983ea52797dfc76023366a8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe6d389a6c448d92b79d89bc9e8489f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/211c130e20ea36d96e88927f88df956e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/950e82a0f9712457f2dd9f8a93f8a217.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/bdbe31a0-2ab3-4ab0-9199-3a509282c045.png?resizew=192)
(2)【方法迁移】如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f89deb952f57f4b3fa4887b098b7b91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0ce914a50f5376766d5065e5f13d96.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bae2736ade41af30db54753220a71eaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/169145cfb31e4fc502a3b2f47a644831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eba8bf0c4a8e49b3fac25832a0b0005.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/5e5c7daa-f6f8-40bc-81bd-7ff4cdc2546b.png?resizew=148)
(3)【定理应用】如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71c472fb321d44281f1e6c4da4ecff6e.png)
![](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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9d972436cf9555f63b7164b6f7feaa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ce6e0c28898e278d164e846536b85f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899f4daf6f7a4d61c16c0f5214461dee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/61f1766e-d8be-456a-acfc-fad9a18f800d.png?resizew=142)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
名校
【推荐1】在等边△ABC中,AB=6,BD⊥AC,垂足为D,点E为AB边上一点,点F为直线BD上一点,连接EF,将线段EF绕点E逆时针旋转60°得到线段EG,连结FG.
①如图1,当点E与点B重合,且GF的延长线过点C时,连接DG,则线段DG的长为 ;
②如图2,点E不与点A,B重合,GF延长线交BC边于点H,连接EH,则
= .
①如图1,当点E与点B重合,且GF的延长线过点C时,连接DG,则线段DG的长为 ;
②如图2,点E不与点A,B重合,GF延长线交BC边于点H,连接EH,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ba632a6424d130db237c5026a694945.png)
![](https://img.xkw.com/dksih/QBM/2021/7/16/2765221694840832/2776635127554048/STEM/afc0ded27ce14017b852e2be3b7a3d66.png?resizew=431)
您最近一年使用:0次
解答题-问答题
|
困难
(0.15)
【推荐2】如图,已知等腰三角形
内接于
,点
为
上一点(不与点
重合),连接
,且
.
为
直径.
①求
的值;
②求四边形
的面积.
(2)如图2,在
上取一点
,使
,连接
,交
于点
,若
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ddbe99c660425b20f26c9bba115d724.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d3055b122bf4953a3d6cc92ab03d74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840fd69d631786111463ec6a6ad5275f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf65c22267bdce5c61dda6259ce0698.png)
②求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd0cf58f7ef662bcbf70bf4bba3c2d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ce56db78adc672c30b332762ee9d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
您最近一年使用:0次
解答题-作图题
|
困难
(0.15)
【推荐3】【问题提出】
(1)如图①,在
中,点
为边
的中点,画出
关于点
的对称图形(点
的对应点记为
),此时四边形
为形状为_________;
【问题探究】
(2)在(1)的条件下,若
,
,求四边形
周长的最大值;
【问题解决】
(3)如图②,某风景区有一段笔直的河流
,有一处自然喷泉(点
)在这条河流上,风景区在现有资金条件下准备修建一条长
米的直通道路
,在道路的尽头
处安装一个张角为
的高清摄像头以观测游客的活动,要求喷泉
恰好在摄像头观测到河流的边界点
、
的正中间,求摄像头能观测区域
的最大面积.
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/4/4f87f735-a3d1-430c-b93b-21dd982d1e70.png?resizew=166)
【问题探究】
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eee296a7d9fba487f1485c61580196f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18444ec3e5e3b8a0cf488732c34866d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
【问题解决】
(3)如图②,某风景区有一段笔直的河流
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cde7aace5b888a1a1c26fb911e2f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/4/d49cb8a7-f1d4-41de-998b-7516ed2d67c9.png?resizew=174)
您最近一年使用:0次