已知
的顶点
在
的边
所在的直线上(不与
重合),
交直线
于点
交直线
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/c3dba5cd-f106-4906-b22c-62801cf30a0a.png?resizew=413)
(1)[初步探究]如图1,若点D,M,N分别在边
上,且
,求证:
;
(2)[深入探究]如图2,若点
在边
上,点
在
的延长线上,点
在边
上,试探究
与
具有什么关系?并说明理由;
(3)[拓展应用]如图3,若点
在
的延长线上,点
与点
重合,点
在
的延长线上,且
,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c962fe4f47732b8e6e83d17ff2b9af13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/169d90af497c854b45805e1127a1a240.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e0ba520c95a7d3565e447314b9054a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/c3dba5cd-f106-4906-b22c-62801cf30a0a.png?resizew=413)
(1)[初步探究]如图1,若点D,M,N分别在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942e6dafcfcbf0682856b9f25178694d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b93f94923c95752b32f39c66d3fd424.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fccd5b8343c55d51d018a9116b7d565.png)
(2)[深入探究]如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7f9fba8a4098c1a0515286eb8d616dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdbad58593bfa5ac1299de80c5a0f9d3.png)
(3)[拓展应用]如图3,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99d27032ecc826bed325c38461a6122b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
更新时间:2024-03-02 00:08:30
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】【概念认识】如图①,在
中,若
,则
,
叫做
的“三分线”.其中,
是“邻
三分线”,
是“邻
三分线”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/b1fffffd-f2ce-4569-83f3-b86938b8f597.png?resizew=571)
(1)如图②,在
中,
,
,若
的三分线
交
于点D,则
°;
(2)如图③,在
中,
、
分别是
邻
三分线和
邻
三分线,且
,求
的度数;
【延伸推广】
(3)在
中,
是
的外角,
的三分线所在的直线与
的三分线所在的直线交于点P.若
,
,直接写出
的度数.(用含m、n的代数式表示)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907010738647677858b8d8300d920341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/b1fffffd-f2ce-4569-83f3-b86938b8f597.png?resizew=571)
(1)如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e702e136211878dce558e0457f15df63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7099026716ee1821dd7d9f157dc055f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc42c06a556f40877176bb5ada88db95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b5c0e0724cce5c25a88dca5e9220c2.png)
(2)如图③,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b88e9a4616bf02cc44fefd7eaf1e4f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
【延伸推广】
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/878e48357ec37956f4d8fb656e7bed8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2c9622dbfc6bd5b5820ed7a952d92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图,四边形ABCD的内角∠DCB与外角∠ABE的平分线相交于点F.
(1)若BF∥CD,∠ABC=80°,求∠DCB的度数;
(2)已知四边形ABCD中,∠A=105º,∠D=125º,求∠F的度数;
(3)猜想∠F、∠A、∠D之间的数量关系,并说明理由.
(1)若BF∥CD,∠ABC=80°,求∠DCB的度数;
(2)已知四边形ABCD中,∠A=105º,∠D=125º,求∠F的度数;
(3)猜想∠F、∠A、∠D之间的数量关系,并说明理由.
![](https://img.xkw.com/dksih/QBM/2019/4/25/2189862797082624/2191715411058688/STEM/a203ab2b-fe11-4f91-a4d3-28e2301172e1.png?resizew=306)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】已知直线
与
轴交于点
,与
轴交于点
经过点
和原点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/63d356b2-5c1d-41ad-b564-9dccb4cfa425.png?resizew=502)
(1)若点
在
上,
交
于点
,如图1,求弦
的长度;
(2)若
与直线
相切于点
,且与
轴的另一交点为点
,如图2,求圆心点
的坐标;
(3)若点
在
的外角
的平分线上,且
与
轴的另一交点为点
,如图3,求半径
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d669402249ce95a2d9eafac997e9d47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d26f4a412fbc1207082b404c01da9b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/11/63d356b2-5c1d-41ad-b564-9dccb4cfa425.png?resizew=502)
(1)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97cf1357a68baf6db404ba9ef1d2756a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】如图,在
中,
,
,点
为
内一点,且
.
![](https://img.xkw.com/dksih/QBM/2020/8/17/2530014474354688/2530431493234688/STEM/fefdc8e0-2177-434f-a390-07381095eb03.png)
(1)求证:
;
(2)若
,
为
延长线上的一点,且
.
①求
的度数.
②若点
在
上,且
,请判断
、
的数量关系,并说明理由.
③若点
为直线
上一点,且
为等腰
,直接写出
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a1d4c140243ba9a9bd7256ec2bbce6.png)
![](https://img.xkw.com/dksih/QBM/2020/8/17/2530014474354688/2530431493234688/STEM/fefdc8e0-2177-434f-a390-07381095eb03.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615423de8cae2a76d73625352c46dbfe.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/e03ca3e334c5290ab28b4b4a883c90c8.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a386524e1e2a7bc2754052f780cd275a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
③若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29b417f46d390b5cac02e1c20f88fdf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6595597d25112f247753397d25bf5080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a13b7c0e1c488447dfa0b234991e31.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图,四边形
是正方形,点
在边
上,
是以
为直角顶点的等腰直角三角形,
分别交
于点
,过点
作
的垂线交的延长线于点
.连接
,请完成下列问题:
(1)求证:
;
(2)求
的度数;
(3)若
,则求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19fb46d53cdfc602a526c99380d7de92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/60ac9d6f-b648-4bb5-b6ab-15db102675f5.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a2c060db26b76886e8ef0f74b41204.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/312bd0568f5dcdc1372ee3f4b33a94cc.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/748aa7bb38597352cad248317ebeed8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
解答题-证明题
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较难
(0.4)
【推荐2】如图,在
中,
是
边上的高,E是
边上的一个动点(不与B,C重合),
,垂足分别为F,G.
![](https://img.xkw.com/dksih/QBM/2021/12/1/2863368118927360/2867352315559936/STEM/4750d81457a74db0be31d0d2a0d0d8f1.png?resizew=183)
(1)求证:
;
(2)
与
是否垂直?若垂直,请给出证明;若不垂直,请说明理由;
(3)当
时,
为等腰直角三角形吗?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a9593dcb41f89af96423c1f157b00d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380f3c2b9f4fe9d658cec27151f2fc8d.png)
![](https://img.xkw.com/dksih/QBM/2021/12/1/2863368118927360/2867352315559936/STEM/4750d81457a74db0be31d0d2a0d0d8f1.png?resizew=183)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af848399b024a2f2855b96591bbcda27.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7afc55b4911a1fa183fb4612c6462d95.png)
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解答题-计算题
|
较难
(0.4)
真题
【推荐1】如图,
是
上的5等分点,连接
,得到一个五角星图形和五边形
.
(1)计算
的度数;
(2)连接
,证明:
;
(3)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1040eb701f098add9ccbeed17cfb17c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460d4dc247a5d1e3f2c6f2186510dd0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ce09449a395d415ca485200bcb2463.png)
(1)计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab0bd9cc4a030e4ad927351234bd8ab8.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f07d2bd240f0a83945dfaaa736fc11df.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/1c3e99b6-2710-4d24-948a-26289181bcd5.png?resizew=169)
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解答题-作图题
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较难
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名校
【推荐2】如图,在菱形ABCD中,点E是BC边上一动点(不与点C重合)对角线AC与BD相交于点O,连接AE,交BD于点G.
(1)根据给出的△AEC,作出它的外接圆⊙F,并标出圆心F(不写作法和证明,保留作图痕迹);
(2)在(1)的条件下,连接EF.①求证:∠AEF=∠DBC;
②记t=GF2+AG•GE,当AB=6,BD=6
时,求t的取值范围.
(1)根据给出的△AEC,作出它的外接圆⊙F,并标出圆心F(不写作法和证明,保留作图痕迹);
(2)在(1)的条件下,连接EF.①求证:∠AEF=∠DBC;
②记t=GF2+AG•GE,当AB=6,BD=6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/2019/5/30/2214710702710784/2215122754789376/STEM/a426bb79168c4c2997743ba1ad7a1637.png?resizew=228)
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解答题-证明题
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较难
(0.4)
真题
【推荐3】在Rt△ABC,∠C=90°,D为AB边上一点,点M、N分别在BC、AC边上,且DM⊥DN.作MF⊥AB于点F,NE⊥AB于点E.
![](https://img.xkw.com/dksih/QBM/2013/9/10/1573679886655488/1573679892922368/STEM/57527a2df2f34328aace783862dc533a.png)
(1)特殊验证:如图1,若AC=BC,且D为AB中点,求证:DM=DN,AE=DF;
(2)拓展探究:若AC≠BC.
①如图2,若D为AB中点,(1)中的两个结论有一个仍成立,请指出并加以证明;
②如图3,若BD=kAD,条件中“点M在BC边上”改为“点M在线段CB的延长线上”,其它条件不变,请探究AE与DF的数量关系并加以证明.
![](https://img.xkw.com/dksih/QBM/2013/9/10/1573679886655488/1573679892922368/STEM/57527a2df2f34328aace783862dc533a.png)
(1)特殊验证:如图1,若AC=BC,且D为AB中点,求证:DM=DN,AE=DF;
(2)拓展探究:若AC≠BC.
①如图2,若D为AB中点,(1)中的两个结论有一个仍成立,请指出并加以证明;
②如图3,若BD=kAD,条件中“点M在BC边上”改为“点M在线段CB的延长线上”,其它条件不变,请探究AE与DF的数量关系并加以证明.
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