【基础巩固】
(1)已知等边
内接于
,点
为
上的一个动点,连接
、
、
.
①如图1,当线段
经过圆心
时,
;(填“
”“
”或“
”)
②如图2,点
为
的任意一点(点
不与点
、点
重合),试探究线段
,
,
之间满足的等量关系,并说明理由;
【拓展提升】
(2)如图3,
内接于![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49bbafaa7d8117da1a389816616cf8d5.png)
,点
是
上一点,连接
,作
于点
,在
上截取
,连接
并延长交
于点
,连接
,
,求
的长.
(1)已知等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49bbafaa7d8117da1a389816616cf8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
①如图1,当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/392cdb9d30684cce244bef94b8d861b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ff7942da6c3fc4005256fb1458557c0.png)
②如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
【拓展提升】
(2)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49bbafaa7d8117da1a389816616cf8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/960af98cec176ddd3d473cb92e06128f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a91155dfb343377bfd290b9e99de501f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49bbafaa7d8117da1a389816616cf8d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7174cc94ff542ec9e65710c63654e7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/5/5aac27a8-daf1-410a-bc8e-a1a9df6fe379.png?resizew=370)
更新时间:2024-03-05 15:20:30
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相似题推荐
解答题-证明题
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【推荐1】如图,在△ABC中,∠ACB=90°,D为AB中点,点E,F分别在直线BC,AC上(点E不与点B,C重合),DF⊥DE,连接EF.
(1)如图1,当点F与点A重合时,AB=8,DE=3,求EF的长;
(2)如图2,当点F不与点A重合时,求证:AF2+BE2=EF2;
(3)若AC=8,BC=6,EC=2,求线段CF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/90180587-5b69-4d80-8071-70b6874f78cf.png?resizew=465)
(1)如图1,当点F与点A重合时,AB=8,DE=3,求EF的长;
(2)如图2,当点F不与点A重合时,求证:AF2+BE2=EF2;
(3)若AC=8,BC=6,EC=2,求线段CF的长.
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【推荐2】已知:AD是△ABC的高,且BD=CD.
(1)如图1,求证:∠BAD=∠CAD;
(2)如图2,点E在AD上,连接BE,将△ABE沿BE折叠得到△A′BE,A′B与AC相交于点F,若BE=BC,求∠BFC的大小;
(3)如图3,在(2)的条件下,连接EF,过点C作CG⊥EF,交EF的延长线于点G,若BF=10,EG=6,求线段CF的长.
(1)如图1,求证:∠BAD=∠CAD;
(2)如图2,点E在AD上,连接BE,将△ABE沿BE折叠得到△A′BE,A′B与AC相交于点F,若BE=BC,求∠BFC的大小;
(3)如图3,在(2)的条件下,连接EF,过点C作CG⊥EF,交EF的延长线于点G,若BF=10,EG=6,求线段CF的长.
![](https://img.xkw.com/dksih/QBM/2019/2/16/2142072690286592/2143279012896768/STEM/a64c351bb56c439097097b8ae1bc5e4b.png?resizew=466)
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【推荐1】如图1,在等腰三角形
中,
是边
上的高线,
.点
是射线
上的一点,作
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/66d053fe-4ca5-4d2a-a474-8bd97b29598e.jpg?resizew=200)
(1)求
,
.
(2)①当点
在线段
上时,若
是以
为腰的等腰三角形,请求出所有符合条件的
的长度.
②如图2,设
交直线
于点
,连接
,若
,则
长为 (直接写出结果).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74722509fe67828d8a092f9123bc570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c246bd6a146bbaa467a8072c2b4bc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac2ef99db257cc1acb08e3a5e0006d49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/66d053fe-4ca5-4d2a-a474-8bd97b29598e.jpg?resizew=200)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
(2)①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
②如图2,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f0bda03812ecde65fe653c6f2b42e6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb3f773cdbd11402ba027c12cbc23f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
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【推荐2】如图①,在矩形ABCD中,点E,F分别在AB,BC边上,DE=AF,且DE⊥AF交于点G.
(1)求证:四边形ABCD是正方形;
(2)如图②,在菱形ABCD中,点E,F分别在AB,BC边上,DE与AF相交于点G,DE=AF,∠AED=60°,AE=8,BF=3,求DE的长.
(1)求证:四边形ABCD是正方形;
(2)如图②,在菱形ABCD中,点E,F分别在AB,BC边上,DE与AF相交于点G,DE=AF,∠AED=60°,AE=8,BF=3,求DE的长.
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【推荐1】部分内容:
【教材呈现】苏科版八年级下册数学课本第86页的部分内容:
请根据教材内容,结合操作1或操作2的方法所得出的结论,我们可以得到三角形中位线定理,_____________.
【方法迁移】
已知
均是等腰直角三角形,且有公共顶点C,
,连接
,M是
的中点.
交
于点N,则
之间的数量关系为:______
(2)如图3,当
时,分别延长
交于点D,连接
,若
.求
的长度;
(3)如图4,当点A、C、F在同一直线上时,连接
,G为
的中点,当
时,
的最小值是_______.
【教材呈现】苏科版八年级下册数学课本第86页的部分内容:
如图1.在![]() ![]() ![]() 操作1.将 ![]() ![]() ![]() 操作2.延长 ![]() ![]() ![]() 试探究 ![]() ![]() |
【方法迁移】
已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18ab90bc616bb91b10f56946caac6f80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63be8050066b82dde1113bc2b09f978a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94afadfe33020dae6c880c8f42c69720.png)
(2)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85b3a6afb6eb425b53def6e1af3b7121.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0b1ba225f7de6a76a64dd357bdcadac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de7040d38542fc8a936a767ade5f5f53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f29acbe697ca024327051fb9d1c53404.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a817561b3054f1ddc89566915f94775e.png)
(3)如图4,当点A、C、F在同一直线上时,连接
![](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/21fe7f306533f388843ff62fa2b5251a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
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【推荐2】定义:在一个等腰三角形底边的高线上所有点中,到三角形三个顶点距离之和最小的点叫做这个等腰三角形的“近点”,“近点”到三个顶点距离之和叫做这个等腰三角形的“最近值”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/98bfcce1-8678-4d83-85b7-60afe2a99df8.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/dbc67e0d-efe2-4388-aa09-26139402e8b7.png?resizew=172)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/60521e16-39ef-45e2-9a1a-3cafc7dd2be9.png?resizew=221)
【基础巩固】(1)如图1,在等腰
中,
,
为
边上的高,已知
上一点E满足
,
,求
;
【尝试应用】(2)如图2,等边
边长为
,E为高线
上的点,将
绕点A逆时针旋转
得到
,连接
,请你在此基础上继续探究出等边
的“最近值”;
【拓展提高】(3)如图3,在菱形
中,过
的中点E作
垂线交
的延长线于点F,连接
,已知
,
,求
“最近值”的平方.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/98bfcce1-8678-4d83-85b7-60afe2a99df8.png?resizew=174)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/dbc67e0d-efe2-4388-aa09-26139402e8b7.png?resizew=172)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/28/60521e16-39ef-45e2-9a1a-3cafc7dd2be9.png?resizew=221)
【基础巩固】(1)如图1,在等腰
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/703c0420c9c3055fb5cc03cd4e737b2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62b2e24adc4473e9e5e797acd5c1141f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27db88a86d838bc3ec5d4ad068fed72f.png)
【尝试应用】(2)如图2,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80651f797ab9dccfd7163c605b091ad5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7572ecc467c061ef71cf4486ec63ec3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
【拓展提高】(3)如图3,在菱形
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b8bb50ffc9f3b89a4bcb3fca852b76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930ee46fdb90f7c2838734b65dea7746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4139b091e9dc432b267ff68420c77de4.png)
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【推荐3】如图①,在平行四边形 ABCD 中,AB=5cm,BC=2cm,∠BCD=120°,CE 平分∠BCD 交 AB 于点 E,点 P 从 A 点出发,沿 AB 方向以 1cm/s 的速度运动,连接 CP,将
绕点 C 逆时针旋转 60°,使 CE 与 CB 重合,得到
,连接 PQ.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/19/77674fea-0a0e-46ec-918e-06ecc1ca7022.png?resizew=499)
(1)求证:
是等边三角形;
(2)如图②,当点 P 在线段 EB 上运动时,
的周长是否存在最小值?若存在求出
周长的最小值;若不存在,请说明理由;
(3)如图③,当点 P 在射线 AM 上运动时,是否存在以点 P、B、Q 为顶点的直角三角形?若存在,求出此时t 的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8617a520589aa336b0c4725d4fd1c7d6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/19/77674fea-0a0e-46ec-918e-06ecc1ca7022.png?resizew=499)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
(2)如图②,当点 P 在线段 EB 上运动时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
(3)如图③,当点 P 在射线 AM 上运动时,是否存在以点 P、B、Q 为顶点的直角三角形?若存在,求出此时t 的值;若不存在,请说明理由.
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解答题-证明题
|
较难
(0.4)
【推荐1】如图,
是
的内接三角形,
,
,连接AO,并延长交
于点D,过点C作
的切线,与BA的延长线交于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/c0e56579-906d-4eac-b3ce-cde037026c08.png?resizew=202)
(1)求证:
;
(2)若
,求线段AE的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3f8cb648966fd4ff28896fe8f9e04d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42ed2e5bd5a0f033e24008697bf4963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/11/c0e56579-906d-4eac-b3ce-cde037026c08.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da1a0de7ce721015d32194af40519e13.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】已知点P在
的直径
上,四边形
内接于
,且
,
,连接
.
(1)如图1,求证:
;
(2)如图2,连接
,
①试说明
与
的面积相等;
②已知
,设
.记
与
的面积分别为
,
.设
,求
的最大值,并求此时x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137eebd1621a51cc5af32b373d983d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7305de9211785b826823153897b17517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6d61339fe6201e7ffa7bc88b9bfc3b7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/a1d99ce3-bdd7-4ea5-8fcd-b0258a816bcf.png?resizew=308)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44cfa3314d5425d86f1608a91d0e5538.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
①试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b465c5d8a5861b7b130e56dde8b1ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b17b75d6a83edb110f3dd91a5f40681.png)
②已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8711eddf26d11fc974dfb6da4b640918.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b465c5d8a5861b7b130e56dde8b1ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b16a00ffc890ef8cfc038e5039983773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e266f1f00b25c1fad57a3e3fd179a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
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