如图,矩形
中,
,点E在折线
上运动,将
绕点A顺时针旋转得到
,旋转角等于
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/f0dfa4d4-a996-4c98-801f-c5a2a127e462.png?resizew=322)
(1)当点E在
上时,作
,垂足为M,求证
;
(2)当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a0ecba7e1969a265ff75bcb17ed9d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/f0dfa4d4-a996-4c98-801f-c5a2a127e462.png?resizew=322)
(1)当点E在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790d5327d89fc1b3145e546482a46a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4714e33baa77ada39336c475a4be1cbe.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bbd04b75eb3db55fc13d78e7c30188.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
更新时间:2022-11-09 19:49:08
|
相似题推荐
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【推荐1】如图,
中,
,
于点O,
,
.
,
的长;
(2)若点D是射线
的一个动点,作
于点E,连结
.
①当点D在线段
上时,若
是以
为腰的等腰三角形,请求出所有符合条件的
的长.
②设直线
交直线
于点F连结
、
,若
,则CD的长为 (直接写出结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b6e4a2df58a236c20df5df0d29a466c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f042c8513aa0d73ed6706f6ac1b36880.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fa61f314be58baeed41c498c876121d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f22c9fa75317eba00b6efec170bb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若点D是射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
①当点D在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5a1e516644950ef35eafd859b262f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
②设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12243199db3e6b8a6a17a52b737d8a4b.png)
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【推荐2】如图,在平面直角坐标系中,AC⊥BC于点C,且点C在y的正半轴上,点A和点B分别在x的负半轴和正半轴,AC=BC,AB=8.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378105403662336/2379941607743488/STEM/dc98d110fa3a4b8abb3eeba761bae1f8.png?resizew=415)
(1)求点C的坐标;
(2)点D从点C出发以1个单位/秒的速度向y的负半轴方向运动,同时点G从点B出发以1个单位/秒的速度向x轴的正方向运动,连接DG交直线BC于点F.设D、G两点运动时间为t秒,△DOF的面积为s,请用t的式子表示s,并直接写出t的取值范围;
(3)在(2)的条件下,过点F作FP⊥DF,过点C作x轴的平行线交FP于点P,连接AD,是否存在t,使△CPF的面积等于△AOD面积的2倍?如果存在,请求出t的值;如果不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/1/16/2378105403662336/2379941607743488/STEM/dc98d110fa3a4b8abb3eeba761bae1f8.png?resizew=415)
(1)求点C的坐标;
(2)点D从点C出发以1个单位/秒的速度向y的负半轴方向运动,同时点G从点B出发以1个单位/秒的速度向x轴的正方向运动,连接DG交直线BC于点F.设D、G两点运动时间为t秒,△DOF的面积为s,请用t的式子表示s,并直接写出t的取值范围;
(3)在(2)的条件下,过点F作FP⊥DF,过点C作x轴的平行线交FP于点P,连接AD,是否存在t,使△CPF的面积等于△AOD面积的2倍?如果存在,请求出t的值;如果不存在,请说明理由.
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【推荐1】【问题再现】人教版《数学》八年级下册第68页有这样一个题:
是一个正方形,点E、F分别是
上的点,且
,问:
吗?为什么?
我们可以通过证明
,从而得出
.若把题中的
换成
,同样可以通过证明
,从而得出
.
中,E,F,G分别是
上的点,
,垂足为点M,求证:
.
(2)如图2,在
的正方形网格中,点A,B,C,D为格点,
交
于点M.则
的度数为______;
(3)如图3,点P是线段
上的动点,分别以
为边在AB的同侧作正方形
与正方形
,连接
分别交线段
于点M,N.
①求
的度数;
②连接
交
于点H,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41467244c303275661ff703920091eeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e444739e269a94733b2b0598b559313.png)
我们可以通过证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7fa7f83e455f9a0cea86cef8aecc24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e444739e269a94733b2b0598b559313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187ed13a7bd532bd39af5e5ad7493a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7fa7f83e455f9a0cea86cef8aecc24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e444739e269a94733b2b0598b559313.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ea7aae6877172e7ac0ca8170868adbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d1c079b0d419e61ee0cfc60194df46a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42fc2d1444a82a57c507e7fbc7ecae80.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67dde0704f1cbf18977df5b4799b4d83.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/66efb2e5b7aa63e8561be256d691fc88.png)
(3)如图3,点P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26bc75797cbb516a4bc0cf8a438988fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2bdc60a42a1addaf772c18972e576fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cc497d9e08a3652fccce2674b5e1bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1bb4915852a20ff1d04cf497cadbf5.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c98538f59b61d4e4ec92f8aa54bf0d.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c021313cc56f7c5215a0671c3d44465.png)
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解题方法
【推荐2】已知顶点为
的抛物线
交
轴于点
,且与直线
交于不同的两点
、
(
、
不与点
重合).
(1)求抛物线的解析式;
(2)若
,
①试说明:直线
必过定点;
②过点
作
,垂足为点
,求点
到点
的最短距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91c72e00a6247aaddc8239722f8e3e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(1)求抛物线的解析式;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67b686b84b7a2b8e2326dbb88af5e855.png)
①试说明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
②过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45b0edca4e802b8d4548dce6f1b0a77d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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【推荐3】综合与实践课,老师让同学们以“矩形的折叠”为主题开展数学活动.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/606a59cf-a826-4c44-84cc-dae1ce74ad5d.png?resizew=505)
(1)操作判断
(2)迁移探究
(3)拓展应用
在(2)的探究中,已知正方形纸片
的边长为
,当
时,请直接写出
的长
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/606a59cf-a826-4c44-84cc-dae1ce74ad5d.png?resizew=505)
(1)操作判断
操作一:对折矩形纸片,使
与
重合,得到折痕
,把纸片展平;
操作二:在上选一点
,沿
折叠,使点
落在矩形内部点
处,把纸片展平,连接
,
.
根据以上操作,当点在
上时,写出图1中
______
;
(2)迁移探究
小爱同学将矩形纸片换成正方形纸片,继续探究,过程如下:
将正方形纸片按照(1)中的方式操作,并延长
交
于点
,连接
.
①如图2,当点在
上时,
______
,
______
;
②改变点在
上的位置(点
不与点
重合),如图3,判断
与
的数量关系,并说明理由.
(3)拓展应用
在(2)的探究中,已知正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18d012a26bb4f9283a64b02d9ee110c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
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【推荐1】如图,在
中,
,
,
.点P从点
出发,沿折线
向终点C运动,点P在
边、
边上的运动速度分别为
、
.在点P的运动过程中,过点P作
所在直线的垂线,交边
或边
于点Q,以
为一边作矩形
,且
,
与
在
的同侧.设点P的运动时间为t(秒),矩形
与
重叠部分的面积为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/2ba1b18b-abc5-4d2a-bbdd-14bf002d7373.png?resizew=166)
(1)求边
的长.
(2)当
时,
,当
时,
.(用含t的代数式表示)
(3)当点M落在
上时,求
的值.
(4)当矩形
与
重叠部分图形为四边形时,求S与
的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b6d19fedaf8488f9637cd64efbca83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4c3365b9a32ebc665837f86a371d6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1337ce85d29edabcc2fadb9a9cc31ce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778cdfe7346279f9695a745fb780e806.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/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44258776aab034ce2634b6ff96cc3967.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/710ec1ef232276cbe77676c2e4b269b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d070106e50e98a1b25b15864db09c856.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/2ba1b18b-abc5-4d2a-bbdd-14bf002d7373.png?resizew=166)
(1)求边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0fed6f944ef4b07f7e33ca893581fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7330af1eaa4fbb442ebc7b47be6b6d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8a53cfc984de5d66c09ed7c09116a91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7330af1eaa4fbb442ebc7b47be6b6d7a.png)
(3)当点M落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(4)当矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43ac79e422ba4876949f0514c44539b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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解答题-问答题
|
较难
(0.4)
【推荐2】【问题探究】
(1)如图1,在矩形
中,连接
,点
分别是
的中点,连接
,若
,
,则矩形
的周长为______;
(2)如图2,正方形
边长为10,
、
分别是边
上的动点,连接
,且
,若
,
,求
与
之间的函数关系式;
【问题解决】
(3)如图3所示,矩形
是某地的一个湖,其中
,点
分别是湖岸
、
的中点.当地政府计划将其改造成一个旅游景点,决定在湖岸
上选一点
,过点
作与
平行的直线
交
于点
,沿
分别建观光长廊,
交
于点
,点
是
的中点,并以
为一边向左侧建一个正方形垂钓中心.设
,正方形垂钓中心的面积为
.
①求
与
之间的函数关系式;
②按照设计要求,发现当
的长度为
时,整体布局比较合理.试求当
时,正方形垂钓中心的面积.
(1)如图1,在矩形
![](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/fae40538fe8b46843bd4dbc04a573fbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/319ff20095c982e8381a6d2176bb5654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091145fcc157587a3fc8e0b7c7c0ecb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9344303efb0541eb449d782ad2b488.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ead4c73cf84f63d33dbb0b5f8c178c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)如图2,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32407054e3fb88934994d9adcf618a67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f721340387f17c4331a5f07a97f7025a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4da0f3603a5854b3fa271fe79b6c97fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7620e6e3d20aa99737afb18b5b5ba161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
【问题解决】
(3)如图3所示,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faca1601bef08e10f3440bdc8b282d89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f8e1eccaa35905f6f0df63881e9557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f16e7189719d00bb593af8ed4d49a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6e066dc559ebea2433e3406f1e1e3bc.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
②按照设计要求,发现当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9da98930bf586e11aa0144f8de1046a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74ee65e2a1989f624536b945dc581235.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图,在平面直角坐标系中,Rt△ABC的三个顶点分别是A(﹣8,3),B(﹣4,0),C(﹣4,3),∠ABC=α°.抛物线y=
x2+bx+c经过点C,且对称轴为x=﹣
,并与y轴交于点G.
(1)求抛物线的解析式及点G的坐标;
(2)将Rt△ABC沿x轴向右平移m个单位,使B点移到点E,然后将三角形绕点E顺时针旋转α°得到△DEF.若点F恰好落在抛物线上.①求m的值;
②连接CG交x轴于点H,连接FG,过B作BP∥FG,交CG于点P,求证:PH=GH.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
(1)求抛物线的解析式及点G的坐标;
(2)将Rt△ABC沿x轴向右平移m个单位,使B点移到点E,然后将三角形绕点E顺时针旋转α°得到△DEF.若点F恰好落在抛物线上.①求m的值;
②连接CG交x轴于点H,连接FG,过B作BP∥FG,交CG于点P,求证:PH=GH.
![](https://img.xkw.com/dksih/QBM/2017/11/16/1818332777218048/1819235964092416/STEM/5562954156f84c9eadbac93230c16be5.png?resizew=215)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】阅读理解:
(1)如图1,等边△ABC内有一点P到顶点A,B,C的距离分别为3,4,5,则∠APB= ,
![](https://img.xkw.com/dksih/QBM/2016/3/8/1573982049910784/1573982056513536/STEM/b183dbd064df4ded9b84772259e57041.png?resizew=188)
分析:由于PA,PB不在一个三角形中,为了解决本题我们可以将△ABP绕顶点A旋转到△ACP′处,此时△ACP′≌ ,这样,就可以利用全等三角形知识,将三条线段的长度转化到一个三角形中从而求出∠APB的度数.
(2)请你利用第(1)题的解答思想方法,解答下面问题:已知如图2,△ABC中,∠CAB=90°,AB=AC,E、F为BC上的点且∠EAF=45°,试猜想分别以线段BE、EF、CF为边能构成一个三角形吗?若能,试判断这个三角形的形状.
(1)如图1,等边△ABC内有一点P到顶点A,B,C的距离分别为3,4,5,则∠APB= ,
![](https://img.xkw.com/dksih/QBM/2016/3/8/1573982049910784/1573982056513536/STEM/b183dbd064df4ded9b84772259e57041.png?resizew=188)
分析:由于PA,PB不在一个三角形中,为了解决本题我们可以将△ABP绕顶点A旋转到△ACP′处,此时△ACP′≌ ,这样,就可以利用全等三角形知识,将三条线段的长度转化到一个三角形中从而求出∠APB的度数.
(2)请你利用第(1)题的解答思想方法,解答下面问题:已知如图2,△ABC中,∠CAB=90°,AB=AC,E、F为BC上的点且∠EAF=45°,试猜想分别以线段BE、EF、CF为边能构成一个三角形吗?若能,试判断这个三角形的形状.
![](https://img.xkw.com/dksih/QBM/2016/3/8/1573982049910784/1573982056513536/STEM/b1b5a7b9467a4463ab3fbc6032f51f04.png?resizew=171)
您最近一年使用:0次