如图,
是
的高,
垂直平分线分别交
,
,
于点
,
,H.连接
,
.
;
(2)若
,求
的长.
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235efb0966d2d2342357833ee4cc0a58.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82773737609e65dea3c5c67099f1b10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
更新时间:2024-05-07 21:57:44
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】完成下列推理说明:
如图,已知
,
.
求证:
.
证明:∵
(已知),
∴
(________________________)
∴
_______(____________________)
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1af62a31d2a34d735c9b9a9035e2633.png)
∴_______
_______(内错角相等,两直线平行)
∴
______(________________________)
∴
(等量代换)
如图,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efaf7b390077d8c7d0540bac6ddee37d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1af62a31d2a34d735c9b9a9035e2633.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/bbe1672b-73eb-4989-b529-ce577b9c5fc5.png?resizew=171)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efaf7b390077d8c7d0540bac6ddee37d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37591109b0a0ec5ffe2133f83310eca.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1af62a31d2a34d735c9b9a9035e2633.png)
∴_______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fce1ddb7003591b033b1a58dc55ede7d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7960538cb70fcf641b94864a90190d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4fd85cff10e8f192cfe0b0a8b2f4996.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知:如图,在等腰三角形
中,
,且
于点
交
的延长线于点
,连接
.请写出
与
的关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d78fc7fcb2762de28dcef8aa3aa0e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6a348b52a882ae4e0b0c0c7b8f0296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21e0bf85d584f05963b6731f31eb2691.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/13/1a08e209-dfda-4e2e-aaa7-3ea9d5fc2d2e.png?resizew=152)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】如图,在
中,
,点O在
上,以
为半径的
交
于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/e9736747-2c52-47dc-8aa3-d813f367d177.png?resizew=148)
(1)尺规作图,补全图形:作
的垂直平分线交
于点E,交
于点F,连接
;
(2)判断直线
与
的位置关系,并说明理由;
(3)若
,
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a69550d878381f6e8fb436e88638f070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/8/e9736747-2c52-47dc-8aa3-d813f367d177.png?resizew=148)
(1)尺规作图,补全图形:作
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)判断直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,在
中,DM、EN分别垂直平分AC和BC交AB于M、N.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/e8d4736e-f4ee-416a-97cd-1c34399bbdec.png?resizew=192)
(1)若
,求
的周长;
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/e8d4736e-f4ee-416a-97cd-1c34399bbdec.png?resizew=192)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d9eeff37b536c0f4f87a276f99686c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bb575c1bc436a2540f4ffdc5d3a5369.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc45352a4828a6c4373ec1ed4c976941.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c463c6b0cf157a0c6565b4852ca82d00.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】人教版初中数学教科书八年级下册第53页设置了如下一个“思考”栏目:
思考
如图,矩形
的对角线
,
相交于点O.我们观察
,在
中,
是斜边
上的中线,
与
有什么关系?
现在,我们一起来探究这条性质的证明过程:
如图1:在
中,
,
是斜边
上的中线.
求证:
.
证明:延长
至点E,使
,连接
,
.
……
(2)定理应用:
如图2,
中,
,D为边
上一点,
于点E,连接
,M为
的中点,
的延长线交
于点F,连接
,
.
①
与
的数量关系是______.
②若
是
的平分线,且
,则
______°.
思考
如图,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
现在,我们一起来探究这条性质的证明过程:
如图1:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
证明:延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0fa1aa5a7a5bb172ed4603f17c8b2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
……
(2)定理应用:
如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32c38dfd14dde969702dff97ef2270f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d777d15cd733338ecfd0ea63819f62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa5521d0070aa23dc0fe22956cc35ee3.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,已知
为等腰直角三角形,
,
.点D为
内一点,且有
,点P为
中点,连接
.
(1)连接
并证明
;
(2)写出线段
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9ae4ef7714ec7519c75eee5fee7b17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/22/edd025bd-c338-49f6-a4ba-cae1d2e3a705.png?resizew=222)
(1)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e16d6aeaf1910d86b297b90295606f.png)
(2)写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3de5366a0b24ca89a1dffb7b1feb02.png)
您最近一年使用:0次