如图,在
中,l是
的垂直平分线,与边
交于点E,点D在l上,且
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/749dd501-7b15-4286-9541-97d2c2f5f567.jpg?resizew=145)
(1)求证:
;
(2)延长
,与
交于点F,若
,
①求证:F是
的中点;
②连接
,若
,则
与
的位置关系是______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9953b7b5c647641edbec4c2ab90a65f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/15/749dd501-7b15-4286-9541-97d2c2f5f567.jpg?resizew=145)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b808676549638806993742ff72619ae.png)
(2)延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d384390f4e0a1e0abd4cc19382d94db.png)
①求证:F是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
更新时间:2024-01-15 15:46:02
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,
中,
,且
,以
为直径作
,点D为
上一点,且
.连接
并延长交
的延长线于点E.
![](https://img.xkw.com/dksih/QBM/2021/3/3/2669952040648704/2669970234949632/STEM/fad8762d7b534ff6aa507277c9902d26.png?resizew=176)
(1)判断直线
与
的位置关系,并说明理由;
(2)求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f8942caf463a6870a02ed7e2dde4dd8.png)
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7305de9211785b826823153897b17517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b63d2504bd3ecce8c10560b142356f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/2021/3/3/2669952040648704/2669970234949632/STEM/fad8762d7b534ff6aa507277c9902d26.png?resizew=176)
(1)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
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解答题-证明题
|
适中
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【推荐2】如图,在
和
中,
、
、
、
在同一直线上,下面有四个条件:
![](https://img.xkw.com/dksih/QBM/2020/2/1/2389724701171712/2390965242920960/STEM/db48c8f18c724523872ca00257edbdb1.png?resizew=232)
①
;②
;③
;④
.请你从中选三个作为题设,余下的一个作为结论,写出一个真命题,并加以证明.
解:我写的真命题是:
已知:____________________________________________;
求证:___________.(注:不能只填序号)
证明如下:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2020/2/1/2389724701171712/2390965242920960/STEM/db48c8f18c724523872ca00257edbdb1.png?resizew=232)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c244edbf77fbb8e9c017515e370c5c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e20b970f3b0dc1c9a3de6eb09beead.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
解:我写的真命题是:
已知:____________________________________________;
求证:___________.(注:不能只填序号)
证明如下:
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适中
(0.65)
【推荐1】
如图所示,作
的角平分线交
于点
,作线段
的垂直平分线分别交
于点
.若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86cae7cc6665dc8edfb9060075b3afb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634f4a08c72d038285f7f0341507fcec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/3/66ed0c49-6977-4ac5-b374-def29ce9337e.png?resizew=151)
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解答题-证明题
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【推荐2】如图,已知
垂直平分线段
,点
是
延长线上一点,点
是
上一点,截取线段
,连接
并延长交
于点
.
![](https://img.xkw.com/dksih/QBM/2023/5/16/3239088310116352/3241220225114112/STEM/d04b7630c6054a4b8023b1e637bbf1ac.png?resizew=154)
(1)若
,求
的度数.
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/2023/5/16/3239088310116352/3241220225114112/STEM/d04b7630c6054a4b8023b1e637bbf1ac.png?resizew=154)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3393b3590c1b09bca24ee67cfb592315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6a23d521606a35298bbf147f7f830c.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c33d149b27f461ec89b0bed3c2df9e07.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,四边形ABCD是平行四边形,
的平分线AE交CD于点F,交BC的延长线于E,且
.
![](https://img.xkw.com/dksih/QBM/2022/5/30/2990519694008320/2991229875044352/STEM/9abea074-20f6-405e-9f62-11f92de7a665.png?resizew=234)
(1)求证:
;
(2)若
,
,求□ABCD的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4567465cfaf832a2c1f8e11838fd1022.png)
![](https://img.xkw.com/dksih/QBM/2022/5/30/2990519694008320/2991229875044352/STEM/9abea074-20f6-405e-9f62-11f92de7a665.png?resizew=234)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34dcfbe7608e104747d56422df7e139e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】课外兴趣小组活动时,老师提出了如下问题:
中,若
,
,求
边上的中线
的取值范围.小明在组内经过合作交流,得到了如下的解决方法:延长
到点E,使
,请根据小明的方法思考:
(1)由已知和作图能得到
的理由是 .
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
(2)求得
的取值范围是 .
A.
B.
C.
D.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142869a7cc5e90b551b38210deff9f0f.png)
(3)如图2,
是
的中线,
交
于E,交
于F,且
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
(1)由已知和作图能得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82e101f2ad5cbdb169f866f0ea82f897.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6720e36b02193db161c61d4017673760.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a290f047f50481318d040c604d72f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beb8b968744573e593ac28451c69729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5eb2decaa6be2df36a5e4b7fabf585d.png)
(2)求得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
A.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f863e3893cda99d0a42b469f9b0438cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e145a085312b8fa4af76b85fd7669413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab7f502effec463bec4889245c4f09a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/142869a7cc5e90b551b38210deff9f0f.png)
(3)如图2,
![](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/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5787c784b686435a2073bdeb836307c.png)
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