在不等边
中,
、
、
是三个内角的平分线(
,
,
),
、
、
是
内切圆
上的三个点,且使得
、
、
(
、
、
)均与
相切.设
的外心、垂心分别为
、
,记
、
、
、
、
、
的中点分别为
、
、
、
、
、
.证明:
、
、
(
)三条直线交于一点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ec7b39ec6b2bbfc75a2138f601f6d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6428870b43fc8d8d0a9f36fb473ff65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79c25815f5d8e948cf30c9e0abe56928.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e238cc4fa07d6a8dab291d0ba43d76a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751b16753f54297b81316b2ee840d78f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38dae3c7302baaa87dae2e2e62032489.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79516f18a7daf0ad467a48e16d0e65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7712ed4fd550f0b60dc2df5b6f75002f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4de790cbd2dfd7fc6175834cfb7df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c0c3464cf2a6154e1532d4406501b49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f4454a161eecf193f0228d1ee51caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85761dbe9320a51595ab2bcfc2ebe608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/785c801b128346a59b13df2fc2194962.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79516f18a7daf0ad467a48e16d0e65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1c28b884ea750661f4d881b7c0f9d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d2e38b2657b82a9e8e9789d021ccbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc8d0d3701ae2205a178ef9afe95486.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd74add83d098d62539e2d8234e2d7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59c709117ab1d3ef620883a732aed68b.png)
2019高三·全国·竞赛 查看更多[1]
更新时间:2018-12-27 11:59:19
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】
是
的内切圆,
依次是边
上的切点,已知
的欧拉线
.证明:
必过
的外心.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09c5b9d864b406b04cdbaf4e8972e4eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b372e638a9dbed3bbf92454d816d212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a71399ec88d4a3bd807e23bef04dce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d64d3a7c478a554bd98b1c2f1789351f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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
中,X、Y为直线BC上两点(X、B、C、Y顺次排列),使得
.设
的外心分别为
,直线
与AB、AC分别交于点U、V.证明:
为等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f80b76fbccc60dcd5a357ec65fd8ac6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bbe994773e6a5b84d8d362d968f02c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6a6a357c919cff32683fba67556a2b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4f5433a5ff7e6d806eb3bfb34bd3a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b00258631bc802d35d78283e439b5167.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/2/a6105991-ebf3-4245-9d84-0e430d34a5af.png?resizew=194)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,
为锐角
的垂心,
与
交于点
,
,点
在边
上,满足
,且
于点
,
为
延长线上一点,满足
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.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/e02455c1fa1343518952136793c1e851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49db6ad031d5602049af30845e196c5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d658b4a737a539f2c892cc54232a5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/789a99f653a0c11da7e29d8380c5f7b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c1115a9568017372597d15d27b04cab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/19/09cef1ca-4275-4ae8-80f2-b5e715fd7ab8.png?resizew=207)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,
的外接圆圆心为
,以
各边为对称轴.求得
的三个对称点
、
、
.现将各点均擦去,仅保留
、
、
,试根据这三个点重新作出
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacb04fa29178c0af4353e4369a7e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacb04fa29178c0af4353e4369a7e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096455798751232/2097584131350528/STEM/4e6c3c3a4e524a3d9733b6ca420b4627.png?resizew=200)
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,圆
和圆
相交于点
,半径
、半径
所在直线分别与圆
、圆
相交于点
,过点
作
的平行线分别与圆
、圆
相交于点
.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fca1d1079fc3ac3e8d44159329865cb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17a5e3927b043383fcec844833d3f093.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f55096e709c47f1f2dfc76fb0d7e0c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/e1aba42c-6a82-463b-af24-7f826d5ea967.png?resizew=287)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】设
为锐角
的垂心,
分别为边
的中点,
交
于点
,
交
于点
,
为
的中点.证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0d54431bbb28ebd98db5c1dc6083a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f27a1f73d012964129e2b6ef13becc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b48ca90a2cd3e4ab923971fba81657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41be02a7bfa7c160357b3a7e5713e71a.png)
您最近一年使用:0次