如图1,在△ABC中,AB=AC,
. 过点A作BC的平行线与∠ABC的平分线交于点D,连接CD.
![](https://img.xkw.com/dksih/QBM/2013/6/14/1573663540977664/1573663546720256/STEM/6556a094-1d58-4620-8cce-f505cdb56db1.png?resizew=468)
(1)求证:
;
(2)点
为线段
延长线上一点,将射线GC绕着点G逆时针旋转
,与射线BD交于点E.
①若
,
,如图2所示,求证:
;
②若
,
,请直接写出
的值(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/597ce705d3a2fe04d29de9e81ec6250d.png)
![](https://img.xkw.com/dksih/QBM/2013/6/14/1573663540977664/1573663546720256/STEM/6556a094-1d58-4620-8cce-f505cdb56db1.png?resizew=468)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56ee81929c987732fcb379802eeef7a7.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6be32a39d99bbd36fff0d12a2708d268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2cb8d279dcbbab395b224eb23945b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b5fa9843496ad71d8ed77292b50eeea.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfab465486d4a4d33480f6a11ebf7ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d5deb26fc3e22a9ac83b0e18b8dfc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1943daad8ff947f91fd85c355bab264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
2013·北京海淀·二模 查看更多[1]
更新时间:2016-12-05 18:09:35
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】已知二次函数
(
为实数),记顶点为
.
(1)直接写出
点坐标(用
的代数式表示);
(2)记该函数图像与
轴交于点
,直线
与
轴所夹的角为
,当
时,求
的值;
(3)若该二次函数的图像经过点
、
,记
,当
时,试探究
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c38f4b2c33af074f2fd21c4529d0eb9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a550c916c64f621010e604a30ef67566.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a550c916c64f621010e604a30ef67566.png)
(2)记该函数图像与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9fc5f31608eeddfc28b69300d91b4e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaacfaef44a654c0a1c283ef03fc0550.png)
(3)若该二次函数的图像经过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4a90cfdbfa05577b6ec0b22739e7c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91ab4021fbd72b6758c37b599ea74df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec425f3d26fb511177895af4a7e38b71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/945c33b7146b45bc1077bdd48b53fcb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91edc7e2d4811f5ea6c01284cf00393a.png)
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【推荐2】如图,双曲线y1=
与直线y2=
的图象交于A、B两点.已知点A的坐标为(4,1),点P(a,b)是双曲线y1=
上的任意一点,且0<a<4.
(1)分别求出y1、y2的函数表达式;
(2)连接PA、PB,得到△PAB,若4a=b,求三角形ABP的面积;
(3)当点P在双曲线y1=
上运动时,设PB交x轴于点E,延长PA交x轴于点F,判断PE与PF的大小关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d77e4ec542fc19c2f918dcba6b25b78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1956507b9f3dc7a99bf88cf01b1b5cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d77e4ec542fc19c2f918dcba6b25b78.png)
(1)分别求出y1、y2的函数表达式;
(2)连接PA、PB,得到△PAB,若4a=b,求三角形ABP的面积;
(3)当点P在双曲线y1=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d77e4ec542fc19c2f918dcba6b25b78.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/29/d927e5a1-df40-4f48-a2b2-31a69d5ed0bd.png?resizew=247)
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【推荐1】如图,AC为⊙O的直径,CF切⊙O于点C,AF交⊙O于点D,点B在DF上,BC交⊙O于点E,且∠CAF=2∠BCF,BG⊥CF于点G,连接AE.
![](https://img.xkw.com/dksih/QBM/2022/3/28/2945972944486400/2946788495826944/STEM/bf127a70-6aad-4ce0-9cf1-95fea80be37b.png?resizew=192)
(1)求∠AEB的度数;
(2)求证:△CBG∽△ABE;
(3)若∠F=60°,GF=2,求⊙O的半径长.
![](https://img.xkw.com/dksih/QBM/2022/3/28/2945972944486400/2946788495826944/STEM/bf127a70-6aad-4ce0-9cf1-95fea80be37b.png?resizew=192)
(1)求∠AEB的度数;
(2)求证:△CBG∽△ABE;
(3)若∠F=60°,GF=2,求⊙O的半径长.
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【推荐2】小东在刘老师的指导下开展“探究四点共圆的条件”活动,得出结论:对角互补的四边形四个顶点共圆.小东继续利用上述结论进行探究.
【提出问题】
如图1,在线段
同侧有两点B,D,连接
,如果
,那么A,B,C,D四点在同一个圆上.
探究展示:
【反思归纳】
(1)上述探究过程中的横线上填的内容是________;
【拓展延伸】
(2)如图3,在
中,
,将
绕点A逆时针旋转得
,连接
交
于点D,连接
.小东发现,在旋转过程中,
永远等于
,不会发生改变.
①根据
,利用四点共圆的思想,试证明
;
②当
为直角三角形,且
时,直接写出
的长.
【提出问题】
如图1,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/023f512b22fed30d4a9d3e408ef61350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
探究展示:
如图2,作经过点A,C,D的![]() ![]() 连接 ![]() ![]() 又∵ ![]() ∴___________, ∴点A,B,C,E四点在同一个圆上(对角互补的四边形四个顶点共圆), ∵点B,D在点A,C,E所确定的 ![]() ∴点A,B,C,D四点在同一个圆上. |
(1)上述探究过程中的横线上填的内容是________;
【拓展延伸】
(2)如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64f5b5c0dd360f325604eaf7863bd7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246b32e19ae21b0cd1f826c47f517ca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae227a8df8dca0b13a17fcaf00cc96e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d16fab0f52c8af5abba0bf19a06ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
①根据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700d23ec3e0d73c7a576b5f4b3b8a6b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3048ae117572e24b27f176b28e89cf.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75a1219bc313db46b07bbd68600267a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc9abe9e42cf396cf527b4ccbd2fefe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解答题-问答题
|
较难
(0.4)
【推荐1】如图1,矩形
的一边落在矩形
的一边上,并且矩形
矩形
,其相似比为
,矩形
的边
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/ed394446-88bd-4b14-b065-32216aa94ba9.png?resizew=447)
(1)矩形
的面积是 ;
(2)将图1中的矩形
绕点
逆时针旋转90°,若旋转过程中
与
夹角(图2中的
)的正切的值为
,两个矩形重叠部分的面积为
,求
与
的函数关系式;
(3)将图1中的矩形
绕点
逆时针旋转一周,连接
、
,
的面积是否存在最大值或最小值?若存在,求出最大值或最小值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10f93679abcee21bacd92c3b1552a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1e7c91d535fc823ff6c5a0282275432.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9c934d84feba963335cc7edf01610e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83cb6327dcbc8a998e6586bcfa7a3b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/8/ed394446-88bd-4b14-b065-32216aa94ba9.png?resizew=447)
(1)矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10f93679abcee21bacd92c3b1552a0e.png)
(2)将图1中的矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10f93679abcee21bacd92c3b1552a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf3ab62bb1858737155a2c2606f5637.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)
(3)将图1中的矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c10f93679abcee21bacd92c3b1552a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
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【推荐2】在平面直角坐标系中,O为原点,点
,点
绕点B顺时针旋转,得
,点
旋转后的对应点为
,记旋转角为
.
(1)如图①,
,边
上的一点M旋转后的对应点为N,当
时,点N的坐标为_____;
(2)在(1)的条件下,当
取得最小值时,在图②中画出点M的位置,并求出点N的坐标;
(3)如图③,P为
上一点,且
,连接
,在
绕点B顺时针旋转一周的过程中,
的面积是否存在最大值和最小值,若存在,请求出;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/993769b494e12c21dff0ee7c53a4a49f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/792374b46ceaf3ca901b148a6e791296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8bfc9876ec81b013fd71a46c3e033b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df026370429ccf589fef3a05e1ac0252.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c0addfc424641e9920195c27d945a40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/8/ef4a8643-9885-4369-815e-841b15531e0f.png?resizew=680)
(1)如图①,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e9344303efb0541eb449d782ad2b488.png)
(2)在(1)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41c7e82c555980a178cdb51b7eab0800.png)
(3)如图③,P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/156e9b10ab97a8b56a9924b9c8bba059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/931b5180de6146058df4df57be30394d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3ec46ccffcce226e3551c7f82d50ef2.png)
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【推荐3】如图1,在
中,
,
,AO是BC边上的中线,点D是AO上一点,
,E是垂足,
可绕着点O旋转,点F是点E关于点O的对称点,连接AD和CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/12/4789e4d2-43a2-4448-a84a-4f8a81c5264c.png?resizew=844)
(1)问题发现:如图2,当
时,则下列结论正确的是_______.(填序号)
①
;②点F是OC的中点:③AO是
的角平分线;④
.
(2)数学思考:将图2中
绕点O旋转,如图3,则AD和CF具有怎样的数量关系?请给出证明过程;
(3)拓展应用:在图1中,若
,将
绕着点O旋转.
①则
_______CF;
②若
,
,在
旋转过程中,如图4,当点D落在AB上时,连结BE,EC,求四边形ABEC的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7a2d73d941f5eee213d170f73793181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882475eea0be0fa89024b38d556fed0d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/12/4789e4d2-43a2-4448-a84a-4f8a81c5264c.png?resizew=844)
(1)问题发现:如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751e4e681b632d1c6d8407bcc8fdcd30.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec991f47f7e5c698c99a9102ca0eba04.png)
(2)数学思考:将图2中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882475eea0be0fa89024b38d556fed0d.png)
(3)拓展应用:在图1中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a443c286a35bd35f0f6a128ae2ff34c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/882475eea0be0fa89024b38d556fed0d.png)
①则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
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