如图:在△ABC中,∠C=90° AD是∠BAC的平分线,DE⊥AB于E,F在AC上,BD=DF;
求证:(1)CF=EB ;(2)AB=AC+CF.
求证:(1)CF=EB ;(2)AB=AC+CF.
![](https://img.xkw.com/dksih/QBM/2019/4/15/2182858798333952/2184572023308288/STEM/8d3a7cb3c9ec4172acb5336ae302686f.png?resizew=110)
15-16八年级上·贵州黔南·期中 查看更多[16]
2015-2016学年贵州省都匀市八年级上学期期中统考数学试卷江西省抚州市广昌一中2016—2017学年下学期八年级期中考试数学试卷湖北省荆州市第一中学2017-2018学年八年级上学期期中模拟试题湖北省襄阳老河口市2017-2018学年八年级上学期期中考试数学试题人教版数学八年级上册第12章全等三角形 检测卷湖北省黄冈市黄梅实验中学2017-2018学年八年级(上)期中数学试天津市南开区津英中学 2018-2019学年八年级上册第一次月考数学试题(已下线)《2018-2019学年同步单元双基双测AB卷》 【人教版】 第12章 全等三角形B卷【校级联考】山东省德州市六校2019届九年级10月联考数学试题广东省阳江市第二中学2018-2019学年八年级上学期第一次(10月)月考数学试题安徽省灵璧县黄湾中学2018-2019学年八年级下学期第一次月考数学试题【区级联考】广西贵港市港南区2018-2019学年八年级下学期期中考试数学试题(已下线)期中检测04-2020-2021学年八年级数学上册专项易错混淆真题选(人教版)(已下线)课时12.2 三角形全等的判定-2021-2022学年八年级数学上册链接教材精准变式练(人教版)河南省新乡市原阳县2021-2022学年八年级上学期第二次月考数学试题 山东省德州市平原县第二中学2022-2023学年八年级上学期期中数学试题
更新时间:2016-12-06 03:25:15
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【知识点】 全等的性质和HL综合(HL)
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】学习了角平分线的性质后,小明进行了拓展性研究.他发现
的外角
和外角
的角平分线
,
交于点
,他猜想
平分
,他的解决思路是利用角平分线性质,过点
分别向
、
、
作垂线,再证明这
和
这两个角所在的三角形全等得出结论.其中小明已经完成过点
分别向
,
作垂线,请根据他的思路完成以下作图与填空:
用直尺和圆规,过点
作
于点
.(保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/34f2e1ea-e18b-436a-b1f2-aa990a2b35d6.png?resizew=189)
己知:如图,
的外角
和外角
的角平分线
,
交于点
,
于点
,
于点
,
于点
.求证:
.
证明:
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
于点
,
于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
①
平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
于点
,
于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b6f4d4d4da9bf16e99be439bbc5022.png)
②
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a90312f69ff2d113e14cd6c28dcde9.png)
,
均为直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b94d816005e091cfed4d1ebdbd92ea1.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108d2497950cd75635b59ba522422a85.png)
由此他得到结论:
三角形两条④平分线所在直线交点与三角形另一个顶点连线平分此内角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac37366d2b54dc7d9a95ac6ddda5f3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7db0641078052bf1af17b4c5a01b9ccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
用直尺和圆规,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a90312f69ff2d113e14cd6c28dcde9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/34f2e1ea-e18b-436a-b1f2-aa990a2b35d6.png?resizew=189)
己知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a90312f69ff2d113e14cd6c28dcde9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7044476eb6e90a781518c230f4637bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ea178b94b0039c40f686c77ebc9a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c93ac1b1b9173ac2ac7e59fcb5540c7.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f4a7f1a6dfa08befdd6f524b57ecf1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76bc8e50eeccced1d7f3bc52e09a7d03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7044476eb6e90a781518c230f4637bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ea178b94b0039c40f686c77ebc9a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fb85f16ecc7e3766ae31816473eadb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db866ecc0c098bfc32ec8a43b65bdd58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a90312f69ff2d113e14cd6c28dcde9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7044476eb6e90a781518c230f4637bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40b6f4d4d4da9bf16e99be439bbc5022.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5fc787a614d10f9c6a63c60927a369a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23a90312f69ff2d113e14cd6c28dcde9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dedb6fd31f905410b78ca10e245c27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3dda800348653ff51eb6b1c8318039.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b94d816005e091cfed4d1ebdbd92ea1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/108d2497950cd75635b59ba522422a85.png)
由此他得到结论:
三角形两条④平分线所在直线交点与三角形另一个顶点连线平分此内角.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,在四边形
中,
,
,试判断
与
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/f1195d98-df6f-4e49-9552-5f33c119349a.png?resizew=160)
您最近一年使用:0次