如图,在△ABC中,DE垂直平分AB,分别交
的边
、
于
、
,
平分
.设
,
.
(1)求
关于
的函数关系式;
(2)当
为等腰三角形时,求∠C的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ec188fb47bf354ccdf0498d32a7d884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2983df9a69cc1d7d390e3da0c3920001.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/2020/4/13/2447763593158656/2449950251540480/STEM/46019c44-ab61-4a60-9f68-a67d3d7e9117.png?resizew=261)
更新时间:2020-04-26 19:39:27
|
相似题推荐
解答题-问答题
|
适中
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名校
【推荐1】如图①,在平面直角坐标系中,点
在x轴上,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/9d86fc0e-97f1-4315-8b22-0e660dc66fa1.png?resizew=239)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/9f6a19d9-a2d3-4990-8ac5-5e3fbbe5d603.png?resizew=237)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/bbb6fea7-f339-4cfd-8180-4917f3506cd6.png?resizew=244)
(1)点A的坐标为______B的坐标为______C的坐标为______
(2)如图②,过点B作
交y轴于点D,求
的大小.
(3)如图③,在图②中,作
分别平分
、
.求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfc96451e44f7ef7e802d2863e2e072c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/9d86fc0e-97f1-4315-8b22-0e660dc66fa1.png?resizew=239)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/9f6a19d9-a2d3-4990-8ac5-5e3fbbe5d603.png?resizew=237)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/bbb6fea7-f339-4cfd-8180-4917f3506cd6.png?resizew=244)
(1)点A的坐标为______B的坐标为______C的坐标为______
(2)如图②,过点B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c631670e02d2a38e9c78708a3916140.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec4a7fc610d0d7fd10f40359bc7b3a10.png)
(3)如图③,在图②中,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83a0e1f9a7dd308c614f620b2cedfcf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b28f28ced0531d1df34fcf04c6c67f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e69a60fb95f19ae60c08e22f3fd5cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
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解答题-证明题
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【推荐2】(1)【问题】如图①,在
中,
平分
,
平分
,若
,则
;若
,则
.
(2)【探究】①如图②,在
中,
三等分
三等分
.若
,则
;
②如图③,O是
与外角
的平分线
和
的交点,试分析
和
有怎样的关系?请说明理由;
③如图④,O是外角
与外角
的平分线
和
的交点,则
与
有怎样的关系?(只写结论,不需证明)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8793053fbb2ac5a3122b092a575124.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cfb5b3f527ff16771f6cb4741f19bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01847a44e59cfd6c285af241c64f04cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cfb5b3f527ff16771f6cb4741f19bc.png)
(2)【探究】①如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e7f08fd57c6d48ce2fb44dda03f89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21eaeb0209e4c9b61132f0324cbba638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01847a44e59cfd6c285af241c64f04cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cfb5b3f527ff16771f6cb4741f19bc.png)
②如图③,O是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
③如图④,O是外角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e142544a6d4e6851096afbd3cbad2fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/ee0a59b1-9e6b-4799-918a-d8fa2639387e.png?resizew=501)
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解答题-证明题
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【推荐1】如图,矩形
中,对角线
的垂直平分线
分别交
,
于点
.
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500037369716736/2500672974987264/STEM/ab24f467-1f24-4d47-8d14-0f995a3c6399.png)
(1)求证:
;
(2)若
,求
的长.
![](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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d5df92548825892c451cc423389ba63.png)
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500037369716736/2500672974987264/STEM/ab24f467-1f24-4d47-8d14-0f995a3c6399.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4c926b35bfd9d887c7d4ceab60231d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐2】如图,四边形ABCD中,AD
BC,E为CD的中点,连结BE并延长交AD的延长线于点F,
(2)连结AE,当AE⊥BF,BC=2,AD=1时,求AB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/638537c0a30676c73fea76c80e0f8bd0.png)
(2)连结AE,当AE⊥BF,BC=2,AD=1时,求AB的长.
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解答题-作图题
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【推荐1】如图,在等腰△ABC中,AB=AC,点D,E分别在边AB,AC上,DE∥BC,点F为线段BD上一点,请仅用无刻度的直尺,分别按照下列要求画图(保留画图痕迹).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/bf0d6c31-e4d7-481e-a5da-58c2ce2be8b1.png?resizew=260)
(1)如图①,作出等腰△ABC的对称轴;
(2)在图②中在等腰△ABC的对称轴上找一点P,使点P到F、B两点的距离之和最短.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/23/bf0d6c31-e4d7-481e-a5da-58c2ce2be8b1.png?resizew=260)
(1)如图①,作出等腰△ABC的对称轴;
(2)在图②中在等腰△ABC的对称轴上找一点P,使点P到F、B两点的距离之和最短.
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【推荐2】如图,在
中,AB=AC=10cm, BC=16cm,DE=4cm.线段DE(端点D从点B开始)沿BC边以1cm/s的速度向点C运动,当端点E到达点C时停止运动.过点E作EF∥AC交AB于点F,连接DF,设运动的时间为t秒(t≥0).
![](https://img.xkw.com/dksih/QBM/2013/4/26/1573644866535424/1573644872507392/STEM/4aa69de37580437e9d75da615f4ea6f5.png)
(1)用含t的代数式表示线段EF的长度为 ;
(2)在运动过程中,△DEF能否为等腰三角形?若能,请求出t的值;若不能,试说明理由.
(3)设M、N分别是DF、EF的中点,请直接写出在整个运动过程中,线段MN所扫过的图形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd936a2405709574af0a73543d94ad9c.png)
![](https://img.xkw.com/dksih/QBM/2013/4/26/1573644866535424/1573644872507392/STEM/4aa69de37580437e9d75da615f4ea6f5.png)
(1)用含t的代数式表示线段EF的长度为 ;
(2)在运动过程中,△DEF能否为等腰三角形?若能,请求出t的值;若不能,试说明理由.
(3)设M、N分别是DF、EF的中点,请直接写出在整个运动过程中,线段MN所扫过的图形的面积.
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【推荐1】某高速公路上有A,B,C三地,C地在A、B两地之间,A,B两地相距420千米.甲、乙两车分别从A,B两地同时出发,沿公路匀速相向而行,分别开往B,A两地.甲、乙两车到C地的路程y(千米)与行驶时间x(小时)的关系如图所示.
(2)求乙车的速度;
(3)直接写出y与x的函数关系式.
(2)求乙车的速度;
(3)直接写出y与x的函数关系式.
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【推荐2】“南果梨”是鞍山市的特产,某水果经销商销售一批南果梨,进价为每千克6元,以每千克10元的价格进行销售,每天可以销售600千克,销售单价每上涨0.5元,则每天销售量减少50千克;若设销售价格为每千克x元
,每天的销售量为y千克.
(1)求y与x的函数关系式;
(2)当每千克的售价定为多少元时,每天的销售利润最大,最大利润为多少元?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7e235ca03aa3c4e1af2f7da04205f37.png)
(1)求y与x的函数关系式;
(2)当每千克的售价定为多少元时,每天的销售利润最大,最大利润为多少元?
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