如图,点C为线段
上一点,分别以
,
为等腰三角形的底边,在
的同侧作等腰
和等腰
,且
.在线段
上取一点F,使
,连接
,
.
;
(2)如图2,若
,
的延长线恰好经过
的中点G,求
的长.
![](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/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a783e5ffcf7a4ea9e531ea76199487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dc12fd638cffc9d0f1daf001b405eec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59e4fee4236fb4f5c8bebc190bf68c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e319f1d61d3146c7e49164f338ac27c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f620db75d870f6052c40689e8af93.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf3746205daae4787d8e31d74ba79e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c4eccda4edcee29a5f15609e85106df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
2024九年级下·全国·专题练习 查看更多[1]
(已下线)重难点02+三角形与特殊三角形2
更新时间:2024-06-09 05:42:27
|
相似题推荐
解答题-问答题
|
较难
(0.4)
解题方法
【推荐1】问题提出
(1)如图,
是
的中线,则
__________
;(填“
”“
”或“
”)
![](https://img.xkw.com/dksih/QBM/2020/6/23/2491027245441024/2493199203229696/STEM/e85fdea5adf6403abf490d1cd65ac4ef.png?resizew=156)
问题探究
(2)如图,在矩形
中,
,点
为
的中点,点
为
上任意一点,当
的周长最小时,求
的长;
![](https://img.xkw.com/dksih/QBM/2020/6/23/2491027245441024/2493199203229696/STEM/d37fc9f5e6554af48b1dbb3ce04305e5.png?resizew=117)
问题解决
(3)如图,在矩形
中,
,点
为对角线
的中点,点
为
上任意一点,点
为
上任意一点,连接
,是否存在这样的点
,使折线
的长度最小?若存在,请确定点
的位置,并求出折线
的最小长度;若不存在,请说明理由.
(1)如图,
![](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/e6d831223c3c4ae2ee718118f97a06d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97392ff60fac8a261c6eab71bba028b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://img.xkw.com/dksih/QBM/2020/6/23/2491027245441024/2493199203229696/STEM/e85fdea5adf6403abf490d1cd65ac4ef.png?resizew=156)
问题探究
(2)如图,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c799fb535233dc4511e9f359c2c1512b.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/2020/6/23/2491027245441024/2493199203229696/STEM/d37fc9f5e6554af48b1dbb3ce04305e5.png?resizew=117)
问题解决
(3)如图,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d91ecf076d7228c124a618c8140be80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5831d6b44ace38d7624c7ced3cc73937.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7356516927ce824b53a570b3f1b0a532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7356516927ce824b53a570b3f1b0a532.png)
![](https://img.xkw.com/dksih/QBM/2020/6/23/2491027245441024/2493199203229696/STEM/ab6703cf26644f7fbd1aa25c82947179.png?resizew=162)
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名校
【推荐2】在正方形
中,点E在边
上,
交
于点M.
(1)如图1,连接
,求证:
.
(2)如图2,点F在
上,
,
交
于点N,
交
于点H,求证:
.
(3)如图3,点P在
的延长线上,
,在直线
的右侧作
,且
,R为线段
的中点,当点E从点B运动到点C时,写出点R运动的路径长并简要说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44e386961ae92ae80a926b593ebde601.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/4cb6616b-ca22-461d-a076-eb8f49bb154d.png?resizew=117)
(2)如图2,点F在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc5a6ff5ceb6885ebc7363ddd55982a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/813a9566b3a4c1995dbb5b4f63074958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b2b420c3c672016f6b3d6bd9a02f26.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/9e29c741-2ac4-422d-bad7-0613c5ef4523.png?resizew=116)
(3)如图3,点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02d224f6847d755ec98d9d42ec0e1f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b681b8e79204d05a31548c2d65c550c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39cc319c2f645ee5f0c7f4f49c5485a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/7d1e6be8-4b81-4d5d-bbe3-f6367599b7a1.png?resizew=239)
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【推荐1】如图,在正方形
中,点
在对角线
上,连接
,
,延长
交
于点
,交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/efea8fe0-8a03-4968-85a2-e60cd6cb2454.jpg?resizew=174)
(1)求证:
.
(2)若
,且
,求
.
(3)若
,
,求正方形的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/efea8fe0-8a03-4968-85a2-e60cd6cb2454.jpg?resizew=174)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/984ea82358d83926755658d818326cda.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41fabe25aa3c56037fbcfa1f2d90fed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/793e03b60fc5ac445d6d44c508e7e73e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4226621a9c781432634758de92e3c6a3.png)
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【推荐2】如图,在平面直角坐标系中,点
为坐标原点,
的顶点
、
的坐标分别为
、
,顶点
在
轴的正半轴上,
的高
交线段
于点E,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/4/b09624ba-18e1-408c-b446-8497617e6666.png?resizew=246)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/4/9f18872f-28d1-463b-b681-691b7622064c.png?resizew=239)
(1)求证:
;
(2)点
在直线
上,设点
的横坐标是
,
的面积为
,请用含
的式子表示
,并直接写出相应的
的取值范围;
(3)在(2)的条件下,是否存在
值,使
?若存在,请求出符合条件的
值及
的长;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fd0825e68122a65426840fbf07cf296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb13bbc5335efc427f9c619a51dae3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b62f6ea86a2ae16d593d5200d8b91964.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/4/b09624ba-18e1-408c-b446-8497617e6666.png?resizew=246)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/4/9f18872f-28d1-463b-b681-691b7622064c.png?resizew=239)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e064fa1e97b8206042c648ce11db380f.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee780a7d0e8811fb04d955304543fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(2)的条件下,是否存在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7404104d32f5187d7134c3d9be229f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
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【推荐1】如图,正方形ABCD中,P为BD上一动点,过点P作
交CD边于点Q.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/a5a361ee-3b8f-484a-b000-eab006811c3e.png?resizew=140)
(1)求证:
;
(2)用等式表示PB、PD、AQ之间的数量关系,并证明;
(3)点P从点B出发,沿BD方向移动,若移动的路径长为4,则AQ的中点M移动的路径长为 (直接写出答案).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/287eb7b9d7d5b93b81550f9c9d54a9ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/9/a5a361ee-3b8f-484a-b000-eab006811c3e.png?resizew=140)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1338b7ce4ef9febae67e068b81284f.png)
(2)用等式表示PB、PD、AQ之间的数量关系,并证明;
(3)点P从点B出发,沿BD方向移动,若移动的路径长为4,则AQ的中点M移动的路径长为 (直接写出答案).
您最近一年使用:0次
【推荐2】已知点P为线段AB上的一点,将线段AP绕点A逆时针旋转60°,得到线段AC;再将线段绕点B逆时针旋转120°,得到线段BD;点M是AD的中点,联结BM、CM.
![](https://img.xkw.com/dksih/QBM/2021/6/9/2739239706001408/2743676690604032/STEM/133a447b67454c979d49a1def3d3affe.png?resizew=512)
(1)如图1,如果点P在线段CM上,求证:
;
(2)如图1,如果点P在线段CM上,求证:
;
(3)如果点P不在线段CM上(如图12),当点P在线段AB上运动时,
的正切值是否发生变化?如果发生变化,简述理由;如果不发生变化,请求出
的正切值.
![](https://img.xkw.com/dksih/QBM/2021/6/9/2739239706001408/2743676690604032/STEM/133a447b67454c979d49a1def3d3affe.png?resizew=512)
(1)如图1,如果点P在线段CM上,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6c6985527134d3cd80e780df581e9a.png)
(2)如图1,如果点P在线段CM上,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f5f0d86c38e2f3c99865f225e1c616.png)
(3)如果点P不在线段CM上(如图12),当点P在线段AB上运动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45aa9dc428cdd15252b9378fe07b8baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45aa9dc428cdd15252b9378fe07b8baf.png)
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【推荐1】如图,以△ABC的一边AB为直径作⊙O,交BC于点D,交AC于点E,点D为
的中点.
(1)试判断△ABC的形状,并说明理由;
(2)直线l切⊙O于点D,与AC及AB的延长线分别交于点F,点G.
①若∠BAC=45°,求
的值;
②若⊙O半径的长为r,△ABC的面积为△CDF的面积的12倍,求BG的长(用含r的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b19c646bcb6160197fdf12a9cb31a0d.png)
(1)试判断△ABC的形状,并说明理由;
(2)直线l切⊙O于点D,与AC及AB的延长线分别交于点F,点G.
①若∠BAC=45°,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc1db5e48db4c59fcdda8812c0431a3.png)
②若⊙O半径的长为r,△ABC的面积为△CDF的面积的12倍,求BG的长(用含r的代数式表示).
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解答题-证明题
|
较难
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【推荐2】如图,△ABC内接于⊙O,AB=AC,∠BAC=α,E是弧AC上一点,点C关于直线AE的对称点为点D,连接AD、BD,BD交AC于点F.
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957152205848576/2957453016948736/STEM/312355ee-2b4c-4e2c-8183-3d3870a0c6d8.png?resizew=279)
(1)已知∠CBD=20°,求∠BAD的度数(用含α的式子表示);
(2)求证:BD经过点E;
(3)若E是弧AC的中点,求证:
.
![](https://img.xkw.com/dksih/QBM/2022/4/13/2957152205848576/2957453016948736/STEM/312355ee-2b4c-4e2c-8183-3d3870a0c6d8.png?resizew=279)
(1)已知∠CBD=20°,求∠BAD的度数(用含α的式子表示);
(2)求证:BD经过点E;
(3)若E是弧AC的中点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fa9c18a82891c29dc2fd19ea48567b3.png)
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