【问题情境】已知
,
,点
,点
分别为
上的点,且
,试探究
和
之间的关系.对于这个问题,小明是这样想的:因为
是
的一个内角,可得
;因为
是平角
的一部分,可得
.对比这两个等式发现:
.那么
和
之间的关系与
和
的大小是否有关呢?
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/5/7a773162-1172-40a6-93e2-21043a2dbd89.png?resizew=145)
小明利用数学课上学习的“从特殊到一般”的思路,设计探究过程如下:
(1)【从“特殊”入手】通过将
和
分别取特殊值,计算
和
的度数,分别填入表中序号处,进而判断它们之间的关系.如上表,请将上表填写完整,你发现了什么结论:______.
(2)【探究“一般”规律】通过取特殊值探究,小明发现
和
之间的关系与
和
的大小无关,于是设
,
,通过推理进一步验证
和
之间的关系,请帮助小明写出推理过程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.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/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2d212c1709b8e72a055cf1b5381ef64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4bd7a29438534f403690ed775cc79e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e044525113d70780e3a3869dc198da20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48385d2f631f647995e0626b56e95f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/5/7a773162-1172-40a6-93e2-21043a2dbd89.png?resizew=145)
![]() ![]() | ![]() ![]() | ![]() ![]() | |
![]() | ① | ② | ③ |
![]() | ④ | ⑤ | ⑥ |
(1)【从“特殊”入手】通过将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
(2)【探究“一般”规律】通过取特殊值探究,小明发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6988b81937a2b98659c359d9ed686146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f32358ce9b92d92097920131f2e5ca7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
更新时间:2024-02-05 12:41:05
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
,
,
,
,
与
交于点
,连接
.求证:
![](https://img.xkw.com/dksih/QBM/2022/12/27/3139730186305536/3153187536609280/STEM/e9372fa8f3714a89aaddc92515468ad6.png?resizew=279)
(1)
;
(2)
;
(3)
平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1493c9f4a3b17fd4286867790cc204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/824b78fd5c038cafd629ed02675c3053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da65cc5b945bf498d06847e6f7a2bdb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://img.xkw.com/dksih/QBM/2022/12/27/3139730186305536/3153187536609280/STEM/e9372fa8f3714a89aaddc92515468ad6.png?resizew=279)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c78e28e81eab02564ba523cf0e5ae2a.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077e820c8fa09189fbcd0b9dbf1ea1d0.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93dd4d854fbc236bccbd97a5d715fe97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff26c7b00acfc1decd1225e68825aa3.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,以直角
的直角顶点O为原点,以OB,OA所在直线为x轴和y轴建立平面直角坐标系,点
,
,满足
.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2967782188244992/2987148827475968/STEM/32638aea-45e1-4a41-bfe8-7c6760fe6c22.png?resizew=150)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2967782188244992/2987148827475968/STEM/2e3dbefe-b351-4949-927f-99afd12a3e3d.png?resizew=147)
(1)直接写出A点的坐标为______;B点的坐标为______.
(2)如图1,已知坐标轴上有两动点M,N同时出发,M点从B点出发沿x轴负方向以1个单位长度每秒的速度匀速移动,N点从O点出发以2个单位长度每秒的速度沿y轴正方向移动,点N到达A点整个运动随之结束.AB的中点C的坐标是
,设运动时间为
秒,是否存在这样的t,使
,
的面积相等?若存在,请求出t的值;若不存在,请说明理由.
(3)如图2,点D是线段AB上一点,满足
,点F是线段OA上一动点,连BF交OD于点G,当点F在线段OA上运动的过程中,
的值是否会发生变化?若不变,请求出它的值;若变化,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/296c31eaede57efe89ffb83f02ad4622.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5612d598e27ac2ce0ab89fb63538bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8171dfb7fc96ca7d8418c618cdfc836b.png)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2967782188244992/2987148827475968/STEM/32638aea-45e1-4a41-bfe8-7c6760fe6c22.png?resizew=150)
![](https://img.xkw.com/dksih/QBM/2022/4/22/2967782188244992/2987148827475968/STEM/2e3dbefe-b351-4949-927f-99afd12a3e3d.png?resizew=147)
(1)直接写出A点的坐标为______;B点的坐标为______.
(2)如图1,已知坐标轴上有两动点M,N同时出发,M点从B点出发沿x轴负方向以1个单位长度每秒的速度匀速移动,N点从O点出发以2个单位长度每秒的速度沿y轴正方向移动,点N到达A点整个运动随之结束.AB的中点C的坐标是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5511a368692de27c58ec48ce968de4a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf4b43b6792b9ae78a1c8cae4e60524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/699ccb1d8c438f5bc838cd3c55dacda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0aac4eb03ed57830e5188a218de064d.png)
(3)如图2,点D是线段AB上一点,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b672beeae70a11673eb3fcc47b95e2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec43226b50f5ff3cd9c3ee4da6458084.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
名校
【推荐1】
中,
,点
、
分别是
边
、
上的两个定点,点
是平面内一动点,令
,
,
.
![](https://img.xkw.com/dksih/QBM/2022/6/25/3009216730357760/3009745026523136/STEM/30e557965cf8400eb50180d6b08eb835.png?resizew=516)
初探:
(1)如图
,若点
在线段
上运动,
①当
时,则
______
;
②
、
、
之间的关系为:______ .
(2)再探:若点
运动到边
的延长线上,如图
,则
、
、
之间有何关系?并说明理由.
(3)拓展:请你试着给出一个点
的其他位置,在图
中补全图形,写出此时
、
、
之间的关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76ffd241623ec4ee9fd08876464def3.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/15c0dbe3c080c4c4636c64803e5c1f76.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307773456102f4d7ea664385029acdc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004fffe57568c3cb76d43794584da944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4626c693586583b09c3008f1d81a76a.png)
![](https://img.xkw.com/dksih/QBM/2022/6/25/3009216730357760/3009745026523136/STEM/30e557965cf8400eb50180d6b08eb835.png?resizew=516)
初探:
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c109cf538970b0f313a06feb5154494f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa61f1be96d581867ea9f074420a2252.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
(2)再探:若点
![](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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
(3)拓展:请你试着给出一个点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780d8fd6c6c1deeeb45e15f639719e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d57899ad4774aed9ccc7bd23db72153.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】如图,△ABC中,AD⊥BC,EF垂直平分AC,交AC于点F,交BC于点E,且BD=DE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/cfc0a891-64a7-452c-9b7c-dd023d74f752.png?resizew=171)
(1)若∠BAE=40°,求∠C的度数;
(2)若△ABC周长为20cm,AC=6cm,求DC长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/cfc0a891-64a7-452c-9b7c-dd023d74f752.png?resizew=171)
(1)若∠BAE=40°,求∠C的度数;
(2)若△ABC周长为20cm,AC=6cm,求DC长.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在四边形
中,
,
,
,
交于点
,过点
作
交
于点
,连接
.
(1)求证:四边形
是菱形.
(2)若
,
,在不添加任何辅助线的条件下,直接写出图中所有等于
的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e735a28578ba191da6d4f3b0f8e8729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b29d66044d614bc0ce7950ad0a931cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/0bb07825-aa97-4fec-a115-a04bd0dda597.png?resizew=271)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ffbbd8250b1459133ab9919b28b0d6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2291de85a2a29ff360a4515cce99c804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
您最近一年使用:0次