在
中,
,
,
是
内的射线,分别过点
,
作
,
,垂足分别为
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/14/f6422db8-d8dc-4ae1-ae44-813b19dfb3cb.png?resizew=249)
(1)证明:
.
(2)若
,
,求
的长.
(3)如图2,
是
的中点,连接
,
.先判断
的形状,再给出证明.
![](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/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ccd5c41c921836b50f8e18abfdc5df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b2cc1d0bfd22c88286880b9da1f6f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/14/f6422db8-d8dc-4ae1-ae44-813b19dfb3cb.png?resizew=249)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83e4f28c096dffd7df54b1162f5b3ae.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60634341a9603e24b2bbc6960abe3d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74625390340982140e449e07663579a2.png)
更新时间:2023-01-13 21:04:25
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】(1)如图,
和
是等腰直角三角形,
,点
在
上,点D在线段
延长线上,连接
,则
的数量关系为______.
(2)如图2,将图1中的
绕点O顺时针旋转
,第一问的结论是否仍然成立,证明你的结论,若不成立说明理由.
(3)如图3,若
,点C是线段
外一动点,
,连接
,若将
绕点C逆时针旋转
得到
,连接
,则
的最大值是_____.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a6f01860fa4e20bbccdb7a595297c2f.png)
![](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/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fe060a37a93ea736e9c3d444809cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fe060a37a93ea736e9c3d444809cd0.png)
(2)如图2,将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5846436d43d452ea8b41fae013d883fb.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ae98eb223b4fe33e53e9d3ba4cc40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/1dc9f4d5-5e43-49e0-a8cf-de6ead098345.png?resizew=494)
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, 在平行四边形
的边
、
上分别截取
、
, 使得
, 连接
, 点M、N是线段
上两点, 且
, 连接
、
.
;
(2)若
,
, 求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a74fa1d77910529e4eda3b2d70f40a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c21d6cb1025dc1990c74a563d151ef0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2c692d4d0b1e022e30a1a993ec1304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0abf3b9ae04184a0bd265fe82040bff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bcb22ca5b9cdfeebca14bdfad0b8f29.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】在
中,
,
.
(1)直线
经过点
,
于
,
于
.
①如图1,求证:
;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/756c6cc9-6227-480a-9dc6-e71eb1f648db.png?resizew=136)
②如图2,猜想
、
、
之间的数量关系,并给出证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/0a0fee2d-3870-4f5e-8a23-e2fcfe4d7ca5.png?resizew=133)
(2)如图3,点
在
上,点
在
上,将线段
绕点
顺时针旋转
,得到线段
,连接
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
(1)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7920d2550a6af7df3db60a33fe02c53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d9b83f3c224fc8e10a46ab71530c2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
①如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e57c76abca2467af86f45da0fec08cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/756c6cc9-6227-480a-9dc6-e71eb1f648db.png?resizew=136)
②如图2,猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/0a0fee2d-3870-4f5e-8a23-e2fcfe4d7ca5.png?resizew=133)
(2)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b045dd77c0bc9e9580e341b506a74266.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/a424cb82-634b-4cff-bf1a-bb890eac84bc.png?resizew=110)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】已知
,
平分
.
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105151765127168/3133372005916672/STEM/c1a3c5be865645b0b9e218899d899d66.png?resizew=132)
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105151765127168/3133372005916672/STEM/1a286236874c4a5194dc9cfb0be5313b.png?resizew=175)
(1)在图1中,若
,
①求
度数;
②求证
;
(2)在图2中,若
,则(1)中的结论
是否仍然成立?若成立,请给出证明;若不成立,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7231ec83386010f305e121ce60e23d02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358c69b4f6c350c35d19d33c69f2a2a8.png)
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105151765127168/3133372005916672/STEM/c1a3c5be865645b0b9e218899d899d66.png?resizew=132)
![](https://img.xkw.com/dksih/QBM/2022/11/8/3105151765127168/3133372005916672/STEM/1a286236874c4a5194dc9cfb0be5313b.png?resizew=175)
(1)在图1中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798a74058ec4bc40b6d9b5d268c359b.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
②求证
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1ddf4296a057936b4e3ee1a96866e5.png)
(2)在图2中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3798a74058ec4bc40b6d9b5d268c359b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd1ddf4296a057936b4e3ee1a96866e5.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐1】已知:如图,
平分
,
.求证:
.
证明如图,延长
,交
于点E.
平分
,
______(角平分线的定义).
而______(公共边),
______(已知),
∴
______(______).
______(______).
∴
是等腰三角形(等腰三角形的定义).
是等腰三角形
顶角的平分线,
∴
(______),
即
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c7187a174aa44ba9c553c47c227c530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/24/660546d4-a728-4330-a79b-df9dfccf367c.png?resizew=195)
证明如图,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/c574f339991ec2ff4e6697ed0012f851.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137605e8f785f8cecebe996654c1b5ea.png)
而______(公共边),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f878027338cc5c2163cfbf9b4ac46caa.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e29d5e1f0cfa24b2073e8f2c0c92051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92da43a84ea2d29fac2e320b516c50f7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a2fd4be3ef6a91bab0592b98f69741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
即
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,在
中,
,
,
,连接
,将线段
绕点
顺时针旋转90°得到线段
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/fe0a86ee-cb62-4d3b-aa7f-e151993ead1c.png?resizew=173)
(1)依题意,补全图形,并证明:
;
(2)求
的度数;
(3)若
为线段
的中点,连接
,请用等式表示线段
与
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/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6901e8b018a80e917540462d2f3aadd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/fe0a86ee-cb62-4d3b-aa7f-e151993ead1c.png?resizew=173)
(1)依题意,补全图形,并证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2cdb82ad470a6d495d887ae362b72cc.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5135b0b4f25d7f5e0077e4fa33216624.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
您最近一年使用:0次