在
中,
为
边上一点,
为线段
上一点,且
.
;
(2)求证:
;
(3)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90dc865781ebfe38b4a75d5184a8956.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d896a2255d3987d1bba1d15c6bcfbe8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa4fdee5b8f30725585026eb6af3463.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14342c5f52a0f5d34f58fc938bfe62a6.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e522f95ee8304ad731ab0a3b32e39439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
更新时间:2024-04-21 13:29:37
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在
中,
,
,直线
分别与
,
交于点
,
,点
是直线
上一动点,将
绕点
逆时针旋转
,得到线段
,连接
.
,根据条件解答下列问题:
①如图1,当点
与点
重合时,直接写出
与
的数量关系;
②如图2,当点
与点
不重合时,①中结论仍然成立吗?如果成立,请证明:如果不成立,请说明理由.
(2)若
,如图3,
,
,连接
,当
最小时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd59cfad8f94e301d4cd3ae46e1810d8.png)
①如图1,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
②如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0af13586681abc06d8b41fab349294ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4836945f324c29ef818b423bcc017a93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7918ecd829a651caeb51d67564527a16.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】如图,
为
的角平分线,
,求证:
是
的垂直平分线小高证明如下:
证明:
平分
,
,
又
点
在
上,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6474284422de867b608967587cc28db9.png)
∴
是
的垂直平分线.
小高的证法正确吗?若不正确,请写出正确的证明过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
证明:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/30/ab58ca61-c743-492f-87c0-9f2030dd3a49.png?resizew=166)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c574f339991ec2ff4e6697ed0012f851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a42abb59ee6ee8d0cc40e8327ef6ee3.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.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/dada4b823d9b13e0dd3cb1e029526cd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6474284422de867b608967587cc28db9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
小高的证法正确吗?若不正确,请写出正确的证明过程.
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,矩形纸片
中,
现把矩形纸片
沿对角线
折叠,点
与
重合,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0b7b7fe8ff2d47adf7f3c71a5544959.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3557809c066e68395b614535a7675e76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/2021/4/23/2706210719440896/2710230641213440/STEM/8a4f1354-ec86-4cdb-8004-f0bd78b3ec4d.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知
为等边三角形,
为中线,延长
至E,使
,连结
.
(1)求证:
;
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a6e2302940c1e7db14855652adec360.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/4/775437e2-7dec-4935-87b5-47017a856622.png?resizew=172)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e792b0ef3d542237ed0903194597651.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,
中,
,
,
,动点P从点B出发,在
边上以每秒
的速度向点A匀速运动,同时动点Q从点C出发,在
边上以每秒
的速度向点B匀速运动,运动时间为t秒(
),连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/e849ab6a-eb3a-429d-959a-a09c59f33ec1.png?resizew=85)
(1)请用含t的代数式表示:
______,
______;
(2)求当t为何值时,
与
相似?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafddfd80f69337909f6eac0f0dbfd59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432043f79e122f291c47453013042704.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5246f1ae6086210504fabdf60b7fa614.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb4337e61fdb8a9e216273edab4579c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/e849ab6a-eb3a-429d-959a-a09c59f33ec1.png?resizew=85)
(1)请用含t的代数式表示:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9985eaef9e31b243d5aaf89b71f66075.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf757b473eb160e42173982184ac5b9.png)
(2)求当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dcc9f79fe5f07f25447aa442ee14ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐2】如图,在平面直角坐标系中,
的顶点
均在正方形网格的格点上.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/71897d7a-0576-4011-9487-f7a0932ab09a.png?resizew=222)
(1)在图中画出
关于
轴对称的图形
;点
的对应点
的坐标是______;
(2)求
的面积;
(3)在
中,
边上的高为______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a8b55f384329b9019ae3e2b21b305a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/71897d7a-0576-4011-9487-f7a0932ab09a.png?resizew=222)
(1)在图中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4310db23fc79936c7182361e652bab1a.png)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】在四边形ABCD中,AB∥CD,∠ABC=60°,AB=BC=4,CD=3.
(1)如图1,求△BCD的面积;
(2)如图2,M是CD边上一点,将线段BM绕点B逆时针旋转60°,可得线段BN,过点N作NQ⊥BC,垂足为Q,设NQ=n,BQ=m,求n关于m的函数解析式.(自变量m的取值范围只需直接写出)
(1)如图1,求△BCD的面积;
(2)如图2,M是CD边上一点,将线段BM绕点B逆时针旋转60°,可得线段BN,过点N作NQ⊥BC,垂足为Q,设NQ=n,BQ=m,求n关于m的函数解析式.(自变量m的取值范围只需直接写出)
![](https://img.xkw.com/dksih/QBM/2019/5/18/2206392566308864/2207052556181504/STEM/3aa985770bdd4a3aaa9e87b987c8b77c.png?resizew=328)
您最近一年使用:0次
解答题-问答题
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适中
(0.65)
解题方法
【推荐2】周日,妈妈带小岚到商场的攀岩墙处玩耍如图,
是一攀岩墙,小岚从攀岩墙底部
处向上攀爬,妈妈站在距离攀岩墙
的
处,当他到达
处时,妈妈看向他的仰角为
,当他到达墙顶
处时,妈妈看向他的仰角为
(小岚妈妈的身高均忽略不计) ,此时攀岩教练开始释放手中的绳子,使小岚以
的速度下落到
处,再减速下落到地面,则他从
处下落到
处需要多长时间? (结果保留整数,参考数据:
) ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df02f4689b210bfd5d75c8d8a859551a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade9841a8e6840efddcfd8620a6fc1fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/996bf3d35b6763cbc1a423b13a9df2dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79fb11b8c808bb9d9a8e1f4c53cddd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69013976336df2cad68c6a3fa41d6bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/8c0332228d978587ff05ccd246c80094.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df02f4689b210bfd5d75c8d8a859551a.png)
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501629281615872/2503416461500416/STEM/fed457558446418c81213d8f01e5ace8.png?resizew=111)
您最近一年使用:0次