如图,在正方形
中,点
在边
上,连接
,作
于点
,
于点
,连接
、
.
![](https://img.xkw.com/dksih/QBM/2021/1/28/2646048840417280/2652060478390272/STEM/8b223bf8-5798-477c-87e8-72b00b03956b.png)
(1)求证:
;
(2)设
,
,
,求证:
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbd99874843902d155f3f9dc26b924f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a07f1c2e24e558238add7d8e040ccaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2646048840417280/2652060478390272/STEM/8b223bf8-5798-477c-87e8-72b00b03956b.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04f8eebda19eded2b059774a8c2666c3.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/922affaee84198702e23236178e25c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1540c26609032922e3fd687cee015b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0f17bf7752084915d8fcf63ca8b0b1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9e19fa6f57ae82220a516826ba6c292.png)
更新时间:2021-02-06 08:53:46
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在正方形ABCD中,点E为AB边上一动点(与点A,B不重合),连接CE,将
的两边所在射线CE,CA以点C为中心,顺时针旋转90°,分别交AD的延长线于点F,G.
(1)求证:
;
(2)用等式表示线段AE、AF与CG之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86a2db6311e228ed33b6c71d0a5918cf.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
(2)用等式表示线段AE、AF与CG之间的数量关系,并证明.
![](https://img.xkw.com/dksih/QBM/2020/2/10/2396214006931456/2396272985022464/STEM/a547520fe7ae4be9894b0b82303303e7.png?resizew=97)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图1,在正方形ABCD中,点E在边CD上(不与点C,D重合),AE交对角线BD于点G,GF⊥AE交BC于点F.
![](https://img.xkw.com/dksih/QBM/2020/6/29/2495127181066240/2495842521612288/STEM/b6238f7be4dd4219b234645c2d689d2f.png?resizew=308)
(1)求证:AG=FG
(2)若AB=10,BF=4,求BG的长
(3)如图2,连接AF,EF,若AF=AE,求正方形ABCD与△CEF的面积之比
![](https://img.xkw.com/dksih/QBM/2020/6/29/2495127181066240/2495842521612288/STEM/b6238f7be4dd4219b234645c2d689d2f.png?resizew=308)
(1)求证:AG=FG
(2)若AB=10,BF=4,求BG的长
(3)如图2,连接AF,EF,若AF=AE,求正方形ABCD与△CEF的面积之比
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】阅读与思考
如图是两位同学对一道习题的交流,请认真阅读下列对话并完成相应的任务.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/54a9d77f-8532-49d2-8df0-46ba017dd66a.png?resizew=581)
解决问题:
(1)写出正确的比例式及后续解答.
(2)指出另一个错误,并给出正确解答.
拓展延伸:
(3)如图,已知矩形ABCD的边长AB=3cm,BC=6cm.某一时刻,动点M从A点出发沿AB方向以1cm/s的速度向B点匀速运动;同时,动点N从D点出发沿DA方向以2cm/s的速度向A点匀速运动,是否存在时刻t,使以A,M,N为顶点的三角形与△ACD相似?若存在,直接写出t的值;若不存在,请说明理由.
如图是两位同学对一道习题的交流,请认真阅读下列对话并完成相应的任务.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/54a9d77f-8532-49d2-8df0-46ba017dd66a.png?resizew=581)
解决问题:
(1)写出正确的比例式及后续解答.
(2)指出另一个错误,并给出正确解答.
拓展延伸:
(3)如图,已知矩形ABCD的边长AB=3cm,BC=6cm.某一时刻,动点M从A点出发沿AB方向以1cm/s的速度向B点匀速运动;同时,动点N从D点出发沿DA方向以2cm/s的速度向A点匀速运动,是否存在时刻t,使以A,M,N为顶点的三角形与△ACD相似?若存在,直接写出t的值;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2022/8/8/3040015471681536/3045661587587072/STEM/289493ff7cc948ce80de6273b3ac91ea.png?resizew=160)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】(1)问题探究:如图1,
,
均为等边三角形,连接
、
,求证:
.
(2)类比延伸:如图2,在
和
中,
,
,连接
、
,求证:
.
(3)拓展迁移:如图3,在四边形
中,
,且
,
,若将线段
绕点D按逆时针方向旋转
得到
,连接
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
(2)类比延伸:如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd9776aa108071b50b71adf181bbdaf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cab3976641d2ad9aa50a30d4c8092cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4b798f9bb5482f0a3cfa1bfd77d245.png)
(3)拓展迁移:如图3,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8049be7e7cd824771471bfac2bf70ae9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12daf5fea89631b84f896939c503d88a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/16/41453063-0eff-41ca-afbc-1280d661c17a.png?resizew=485)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】【小题热身】如图1,过抛物线
上一点
作
轴交抛物线于点B,延长
到点D,使
,过点D作
交抛物线于点C,连接
,求
的值.
【举一反三】参加学校“举一反三”社团的小明在解答完成上述问题后,运用学到的“控制变量法研究该题,并发现:①只改变点A在抛物线上的位置,
的值不变化;②只改变a的大小或只改变
的长,
的值改变.于是运用“问题一般化”的方法研究该题,并提出如下问题:
过抛物线
上一点
作射线
轴交抛物线于点B,在射线
上取一点D,使
,过点D作
交抛物线于点C,连接
,如图1和图2,请选择图1或图2,求
的值.(用含a、b的代数式表示)
【拓展延伸】如图3,在抛物线
上任取一点A,过点A作射线
轴交抛物线于点B,在射线
上点B的左右两侧各有一个动点D、E,分别过D、E作
垂线交抛物线于C、F,
交
于点G,连接
,则
、
、
、
中有两个三角形的面积始终相等,请写出你的发现,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf210c8c9e83e70f2d3ede1e18a5f3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/115a0c87ac14dbb770c95d74d6e26073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ecbb94ac8dfe5fbc3bffad8c9da301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a24a8f5e8fb89381f8add6549170345.png)
【举一反三】参加学校“举一反三”社团的小明在解答完成上述问题后,运用学到的“控制变量法研究该题,并发现:①只改变点A在抛物线上的位置,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a24a8f5e8fb89381f8add6549170345.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a24a8f5e8fb89381f8add6549170345.png)
过抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45848d377cad2507fe6846d0882005e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6f21e6b04eeb3ff085e06dd68681c40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ecbb94ac8dfe5fbc3bffad8c9da301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc490fd9c850622aa2beaf5d38d46459.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4ab7e657f01bdfa235f8c4d6681d13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a24a8f5e8fb89381f8add6549170345.png)
【拓展延伸】如图3,在抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45848d377cad2507fe6846d0882005e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ecbb94ac8dfe5fbc3bffad8c9da301.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b85188c90e4e84c42ebe737fdbe42778.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20227c155003de7163d407daf0a5e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/32affbe6-1757-41eb-8d71-c6891559d044.png?resizew=510)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,已知抛物线
的对称轴为直线x=1,与x轴的一个交点为
,顶点为B.点
在抛物线上,直线BC交x轴于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/26a589bb-d435-49d8-92b3-7d629074fd92.png?resizew=146)
(1)求抛物线的表达式及点E的坐标;
(2)连接AB,求∠B的余切值;
(3)点G为线段AC上一点,过点G作CB的垂线交x轴于点M(位于点E右侧),当△CGM与△ABE相似时,求点M的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e31372ebc93ef965b22d01594e06abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b8c639c851e0044ee22020324c5570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16e7b9125d5f86eb4e8c179c8fac77af.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/17/26a589bb-d435-49d8-92b3-7d629074fd92.png?resizew=146)
(1)求抛物线的表达式及点E的坐标;
(2)连接AB,求∠B的余切值;
(3)点G为线段AC上一点,过点G作CB的垂线交x轴于点M(位于点E右侧),当△CGM与△ABE相似时,求点M的坐标.
您最近一年使用:0次