如图,已知
中,
,
,
,
是
边上的一个动点,点
从点
开始以
的速度向点
运动,设运动的时间为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/9a1ce91c-9be5-4065-bd40-c60615237803.png?resizew=153)
(1)判断
的形状,并说明理由.
(2)若
是等腰三角形,求此时的运动时间.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f5a152f235942d11c74ef518fca7bba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea6d6597d07c8e98ca0c21d2527942ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658dfdb747bd314cd22e3a526aba5ec6.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240ecdd3d8ef73e6a7c3b9bc6b03409.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65a54eb2123d9eafa3b923287abe8b5e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/14/9a1ce91c-9be5-4065-bd40-c60615237803.png?resizew=153)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/147de24f071e316b68fd2e78e3c84545.png)
更新时间:2024-01-14 23:40:05
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相似题推荐
解答题-证明题
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适中
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【推荐1】如图1,在平面直角坐标系
中,点
,
,
,给出如下定义:若P为
内(不含边界)一点,且AP与
的一条边相等,则称P为
的友爱点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/5bc16dc6-133d-4233-83b7-5a1292e52d4c.png?resizew=523)
(1)在
,
,
中,
的友爱点是________;
(2)如图2,若P为
内一点,且
,求证:P为
的友爱点;
(3)直线l为过点
,且与
轴平行的直线,若直线
上存在
的三个友爱点,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a525534689bd2701205d4ab17574c39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316ba5cbb31299d683ac6c7dd795db85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dc03fafb03395ed84030f03c5d93aa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357265c532428e886a643e8e653eec9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/6/5bc16dc6-133d-4233-83b7-5a1292e52d4c.png?resizew=523)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060d1c53c01544f17dc815c052648ed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3baa9095863d7c0f6920b381cb43621b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5478fcc7144d030ad940c260d7bf989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)如图2,若P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae347fd3c8ad090bd0e530650e2e1af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)直线l为过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56dba6ef0c00b3442464e6d0f39cf5c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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解答题-问答题
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【推荐2】已知
ABC中∠BAC=120°,BC=26,AB、AC的垂直平分线分别交BC于E、F,与AB,AC分别交于点D、G.求:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/04c12d92-2860-458f-ae3d-6be07756d3a9.png?resizew=204)
(1)直接写出∠B与∠C的角度之和.
(2)求∠EAF的度数.
(3)求
AEF的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/04c12d92-2860-458f-ae3d-6be07756d3a9.png?resizew=204)
(1)直接写出∠B与∠C的角度之和.
(2)求∠EAF的度数.
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
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解答题-证明题
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【推荐1】我们知道平行四边形有很多性质,现在如果我们把平行四边形沿着它的一条对角线翻折,会发现这其中还有更多的结论.
【发现与证明】在
ABCD中,AB≠BC,将△ABC沿AC翻折至△AB′C,连结B′D.
(1)填空:B′E DE(填“<,=,>”);
(2)求证:B′D∥AC;
【应用与探究】
(3)在
ABCD中,已知:BC=4,∠B=60°,将△ABC沿AC翻折至△AB′C,连结B′D.若以A、C、D、B′为顶点的四边形是矩形,求AC的长.
【发现与证明】在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
(1)填空:B′E DE(填“<,=,>”);
(2)求证:B′D∥AC;
【应用与探究】
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a5328919a7cec382c2e91c9c528fc1.png)
![](https://img.xkw.com/dksih/QBM/2019/3/26/2168962729697280/2176580513079296/STEM/f43cb092bec14cd396a59793ebf20b76.png?resizew=157)
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解答题-证明题
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【推荐2】如图,
是
的直径,点
是
的内心,
的延长线交
于点
,连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/df211cf8-6183-4e29-b1de-967f4a28aa6b.png?resizew=171)
(1)求证:
;
(2)连接
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/df211cf8-6183-4e29-b1de-967f4a28aa6b.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/503668fcc7878c81c664c13fa47cba29.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca7b8ab7744c97d136d96bdcd9b402cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5509269c540ac83ba34d2e8a31242903.png)
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【推荐1】如图,在
中,
,
垂直平分线段
交
于点
,交
于点
,在射线
上取一点
,使得
,过点
作
,垂足为
.
![](https://img.xkw.com/dksih/QBM/2019/11/28/2343600660086784/2344276566958080/STEM/f401813d-225c-4e4d-b847-704b9bf48cc8.png)
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42130af22a1a054d6e24605de132cea1.png)
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.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/895dc3dc3a6606ff487a4c4863e18509.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/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf8f33fe22cd052bde3f834c6121838.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2019/11/28/2343600660086784/2344276566958080/STEM/f401813d-225c-4e4d-b847-704b9bf48cc8.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42130af22a1a054d6e24605de132cea1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/673d99b3fac07cdb588f1a44fe550827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐2】如图,在平面直角坐标系中,直线
与双曲线
相交于点A,B,已知
.
![](https://img.xkw.com/dksih/QBM/2021/5/7/2716030335131648/2721698183266304/STEM/b1f91886-01bd-49aa-bd89-33a4bd8beebe.png)
(1)求
的长.
(2)利用图象,求不等式
的解.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/501a6d50c937729c8d0f02b2b62a0ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07854693dd2e33f66030d6106eb6e0ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f707ccfedd2028334caf2b31b2c1223e.png)
![](https://img.xkw.com/dksih/QBM/2021/5/7/2716030335131648/2721698183266304/STEM/b1f91886-01bd-49aa-bd89-33a4bd8beebe.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(2)利用图象,求不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42d163b7d1156ca8439e7c53c833c72.png)
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解答题-作图题
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【推荐1】如图,将
ABC绕点B顺时针旋转90°得到
DBE(点A,点C的对应点分别为点D,点E).
(1)根据题意补全图形;
(2)连接DC,CE,如果∠BCD=45°.用等式表示线段DC,CE,AC之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)根据题意补全图形;
(2)连接DC,CE,如果∠BCD=45°.用等式表示线段DC,CE,AC之间的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/c0714074-3538-41be-ae9a-7e098f8613ba.png?resizew=134)
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【推荐2】如图,在边长为1的小正方形组成的网格中,△ABC的三个顶点均在格点上,请按要求完成下列各题:
(1)画线段AD∥BC,且使AD=BC,连结CD.
(2)线段AC的长为 ,CD的长为 ,AD的长为 .
(3)△ACD为 三角形.
![](https://img.xkw.com/dksih/QBM/2017/10/14/1802245279236096/1810204364914688/STEM/47d9922ebb1e4138b7a38594de3086c2.png?resizew=132)
(1)画线段AD∥BC,且使AD=BC,连结CD.
(2)线段AC的长为 ,CD的长为 ,AD的长为 .
(3)△ACD为 三角形.
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