【问题探究】
(1)如图1,已知
中,
,
,
,点D是
的中点,连接
,则
的长为________.
(2)如图2,已知
中,
,P为
内一点,且
,
,请求出
的长度;
【问题解决】
(3)如图3,四边形
中,
,
,
,
,
,点P为四边形
内一点,且始终有
,连接
,请问是否存在一点P,使得
的值最小?如果存在,求出
的最小值;如果不存在,请说明理由.
(1)如图1,已知
![](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/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.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/03902478df1a55bc99703210bccab910.png)
(2)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e3ae297f2c52ed121490345e0990434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fddda9e7f4d7140bf357d76c9e23d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
【问题解决】
(3)如图3,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0366806a0974645702ace8bc6d3d5671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7e2f295ed0a7d3a863795226348e255.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7e2f295ed0a7d3a863795226348e255.png)
更新时间:2024-06-01 14:59:38
|
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【推荐1】如图,
,
,
是
中的三条弦,且
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.
,测量
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,
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(2)如图2,若
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;
(3)如图3,若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a15d2ac83000af19c3e3bb308656f62.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf47fcc720457c94bea190cdc6547745.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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【推荐2】如图,△ABC是等边三角形,点E、F分别为AB、AC上的点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/bf2e4f64-a12f-44c4-907f-8e197665ff92.png?resizew=209)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/cc58d841-dd7b-4331-82b0-5ba11cd895ad.png?resizew=208)
(1)如左图,若BE=AF,连接CE、BF交于点P,连接AP,且AP⊥CE,求证:2BP=CP;
(2)如右图,连接BF,点P是BF上一点,∠APB=120°,连接AP、CP,E为AB中点,连接EP,探究线段EP和CP的数量关系,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/bf2e4f64-a12f-44c4-907f-8e197665ff92.png?resizew=209)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/cc58d841-dd7b-4331-82b0-5ba11cd895ad.png?resizew=208)
(1)如左图,若BE=AF,连接CE、BF交于点P,连接AP,且AP⊥CE,求证:2BP=CP;
(2)如右图,连接BF,点P是BF上一点,∠APB=120°,连接AP、CP,E为AB中点,连接EP,探究线段EP和CP的数量关系,并证明你的结论.
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【推荐1】![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/148ef894-d9f7-4eb9-be36-687176d18e0c.png?resizew=658)
(1)如图1,在菱形ABCD中,E,F分别是AB和BC上的点,且BE=BF,则DE与DF之间的数量关系是 .
(2)[变式感知]在菱形ABCD中,∠A=60°,∠EDF的两边DE,DF分别交菱形的边AB,BC于点E,F.如图2,当∠EDF=60°时.
①AE+CF AD;(填“<”、“>”或“=”)
②如图3,若DE=4,AE=CF,求AB的长.
(3)[拓展应用]如图4,当∠EDF=90°时,若AB=60,AE+CF=32,求△DEF的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/148ef894-d9f7-4eb9-be36-687176d18e0c.png?resizew=658)
(1)如图1,在菱形ABCD中,E,F分别是AB和BC上的点,且BE=BF,则DE与DF之间的数量关系是 .
(2)[变式感知]在菱形ABCD中,∠A=60°,∠EDF的两边DE,DF分别交菱形的边AB,BC于点E,F.如图2,当∠EDF=60°时.
①AE+CF AD;(填“<”、“>”或“=”)
②如图3,若DE=4,AE=CF,求AB的长.
(3)[拓展应用]如图4,当∠EDF=90°时,若AB=60,AE+CF=32,求△DEF的面积.
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【推荐2】如图1,在
中,
,
,点
和点
是边
上两点,连接
,得到
是一个等边三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/fe814970-5767-4650-8aaf-b73c9b082d7c.png?resizew=679)
(1)求证:
;
(2)将等边
绕点
旋转至如图2所示的位置,点
仍然在边
上,点
落在边
外,连接
,求证:
;
(3)在(2)的条件下,若
,
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
(2)将等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25ab46164b23af7a4c4907f176e392ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93bc4c9dd737193f7acce692b23500d4.png)
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解答题-计算题
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【推荐3】阅读下面材料,并解决问题:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/c1f8c772-0d46-46ab-a23d-38e40060160e.png?resizew=405)
(1)如图(1),等边
内有一点P,若点P到顶点A、B、C的距离分别为3、4、5,则
.由于
不在同一个三角形中,我们可以将
绕顶点A逆时针旋转
,得到
.这样就可以利用全等三角形知识,将三条线段长度转化到一个三角形中,从而求出
的度数.请给出计算证明过程.
(2)请你利用(1)题的解答思想和方法,解答下面的问题:
已知:如图(2),
,D、E为
上的点且
,请你探索线段
,
三条线段之间的数量关系,并证明你的结论.
(3)请你利用第(2)题的结论,解答下面的问题
已知:如图(3),
中,
,D,E为
边上的点,
,
,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/17/c1f8c772-0d46-46ab-a23d-38e40060160e.png?resizew=405)
(1)如图(1),等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3cbe52205e9c724bf7e12a2ccbc02bc.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b0d8021f3b6389aa58008fba6738b3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20592db1026476ba6b2ab0ee9c3b08b.png)
(2)请你利用(1)题的解答思想和方法,解答下面的问题:
已知:如图(2),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1a10b3230a9a0c45d89b0ee686e1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69d58d6e8777be547f0f40d831a29986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2743a6e2019ef29113fad741ecd158c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9171484a68c84cad91e4f2233392f600.png)
(3)请你利用第(2)题的结论,解答下面的问题
已知:如图(3),
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed1a0e0c3e716b8be5e888f2859f322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f15e4d0d1f17b366bae04c5df3ab8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b52f8cc071125aee6f1fb872fb16d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
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【推荐1】阅读下列材料:问题:如图1,在菱形
和菱形
中,
,点A,B,E在同一条直线上,P是线段
的中点,连接
,
,探究
与
的位置关系.
(1)请你写出上面问题中线段
与
的位置关系,并说明理由;
(2)将图1中的菱形
绕点B顺时针旋转,使菱形
的对角线
恰好与菱形
的边
在同一条直线上,原问题中的其他条件不变(如图2).你在(1)中得到的结论是否发生变化?写出你的猜想并加以证明,
(3)将菱形
和菱形
均改成正方形,如图3,P为
的中点,此时
与
的位置关系和数量关系分别是什么?直接写出答案.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c5f3f3ab861429d91093284373a3e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(1)请你写出上面问题中线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)将图1中的菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)将菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc7ee0ef8945ba1b90e59aed7cab889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4505508b3e36db64a207dcdaf8eb22dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/13/2fb4c31e-748d-4419-a955-60296a422db5.png?resizew=612)
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【推荐2】已知
为等边三角形,
是边
上一点,连接
,点
为
上一点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/a2bc87aa-7b4f-41f5-9214-e8a67fdc143f.png?resizew=445)
(1)如图1,延长
交
于点
,若
,
,求
的长;
(2)如图2,将
绕点
顺时针旋转
到
,延长
至点
,使得
,连接
交
于点
,猜想线段
,
,
之间存在的数量关系,并证明你的猜想;
(3)如图3,
,点
是
上一点,且
,连接
,点
是
上一点,
,连接
,
,将
沿
翻折到
,连接
,当
的周长最小时,直接写出
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/10/a2bc87aa-7b4f-41f5-9214-e8a67fdc143f.png?resizew=445)
(1)如图1,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a15c96282140b14c3eef6b38ecc5e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983a8d7745d1440cdbc7e6a65b25c3c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2657e02314469ad2b13d31dce41b4343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb1975abdfba3d89ee75a40e4239f6e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b4a957b92f7b56edcf641bf6bb62b3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a459f78e4a3516d8a8535290ede7f386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.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/08f68bd2acb2e8ce9470a459593c0664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60a6d4262a27fe78fbc37f8e4c151788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ebffbdca89cc68c33706ab069fc6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ad8115387158c8dda205d26968ba11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e14498f351fa401493673298e905502.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ad8115387158c8dda205d26968ba11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03f109321a27cf3d57af35f79ca41eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e477522beeab09072b31fc291a75d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e970cff9097bb7b6d139f52b3829e1bd.png)
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【推荐3】如图,在平面直角坐标系中,O是坐标原点,抛物线
经过点
和点
.
(1)求抛物线的表达式;
(2)如图,线段
绕原点O逆时针旋转
得到线段
.过点B作射线
,点M是射线
上一点(不与点B重合),点M关于x轴的对称点为点N,连接
,NB.
①直接写出
的形状为 ;
②设
的面积为
,
的面积为是
,当
时,求点M的坐标;
(3)如图,在(2)的结论下,过点B作
,交NM的延长线于点E,线段BE绕点B逆时针旋转,旋转角为
得到线段BF,过点F作
轴,交射线
于点K,
的角平分线和
的角平分线相交于点G,当
时,请直接写出点G的坐标为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/963c37197b63fe6d61f2ab420e42a2a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09a3fee4ffe0cbff5ac78f2abc646da7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978c000436070ec2a44321319f04cf46.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/22/fc32ff3e-ff80-405e-a008-6785b0ebd4ef.png?resizew=170)
(1)求抛物线的表达式;
(2)如图,线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.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/2d567bdeba9b8e17d0911f594e141eed.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/22/79cabfd8-657b-47a5-a81d-5cb083c41c79.png?resizew=175)
①直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbec471ffed534e60ec40d48b9f0968.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbec471ffed534e60ec40d48b9f0968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a4b47633857e9262eba75f69a0d298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b8cb66e7ce1988ccfb4298f6b0cdcf8.png)
(3)如图,在(2)的结论下,过点B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9398c67f773508be1bce2407ddaf0c79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30caabb833fc8474d5d21a1a1d413e5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1066e246fc28402d13d55c4a58ad2ff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cf2ea46b5a0686685153bc40ba04a09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101bccc0147dd0faf40ddb24fe77781a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ef0959d0dd08e351554ebdd18eda67.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/22/c5599660-b79a-4c5e-a96c-e04bf04ec52e.png?resizew=180)
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【推荐1】综合与实践
问题提出:
某兴趣小组开展综合实践活动.如图1,在矩形
中,
为对角线,
是
上一动点(不与点
重合),过点
作
交
于点
,过点
作
交
于点
,连接
与
交于点
.设
的面积为
.经探究发现
是关于
的二次函数,并绘制成如图2所示的图象,图2中点
的横坐标为3,请根据图1和图2的信息回答问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/5f7ab5d8-1b42-43e7-a154-57b322f2bd7d.png?resizew=300)
初步感知:
(1)①图1中,
的长为______,
的长为______;
②求点
的纵坐标
的值;
(2)求
关于
的函数解析式及
的最大值;
延伸探究:
(3)连接
,请求出
长度的最小值.
问题提出:
某兴趣小组开展综合实践活动.如图1,在矩形
![](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/0985100fc9182826f193d8d8a4ee6e40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a24ee04b7e461c045431ce83d15a91de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84756764173829ecd7d0272785c7e19.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/de1410dc83d5770a1d7c2d26a8fb7030.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dba190466c61e55dccb6caf322aa9a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/5f7ab5d8-1b42-43e7-a154-57b322f2bd7d.png?resizew=300)
初步感知:
(1)①图1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
②求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
延伸探究:
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce6c0e9de83f2e64ae33609fc08459d.png)
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【推荐2】【温故知新】黄金分割是一种最能引起美感的分割比例,具有严格的比例性、艺术性、和谐性,蕴藏着丰富的美学价值.我们知道:如图1,如果
,那么称点C为线段AB的黄金分割点.
![](https://img.xkw.com/dksih/QBM/2022/2/11/2914024446476288/2914688599515136/STEM/4f36b6ac-dc2e-427c-86fb-e14982e6bd2c.png?resizew=341)
![](https://img.xkw.com/dksih/QBM/2022/2/11/2914024446476288/2914688599515136/STEM/e119d97b-4491-4e28-b57f-f797cbb86032.png?resizew=299)
(1)【问题发现】如图1,请直接写出AC与AB的比值是 .
(2)【问题探究】如图2,在Rt△ABC中,∠C=90°,BC=1,
,在BA上截取BD=BC,在
上截取
,则
的值为 .
(3)【问题解决】如图3,用边长为6的正方形纸片进行如下操作:对折正方形ABDE得折痕MN,连接EN,点A对应点H,得折痕CE,试说明:C是AB的黄金分割点;
(4)【拓展延伸】如图4,正方形ABCD中,M为对角线BD上一点,点N在边CD上,且CN<DN,当N为CD的黄金分割点时,∠AMB=∠ANB,连NM,延长NM交AD于E,请用相似的知识求出
的值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd2dee4fe5fa66128ba27f0b83da5663.png)
![](https://img.xkw.com/dksih/QBM/2022/2/11/2914024446476288/2914688599515136/STEM/4f36b6ac-dc2e-427c-86fb-e14982e6bd2c.png?resizew=341)
![](https://img.xkw.com/dksih/QBM/2022/2/11/2914024446476288/2914688599515136/STEM/e119d97b-4491-4e28-b57f-f797cbb86032.png?resizew=299)
(1)【问题发现】如图1,请直接写出AC与AB的比值是 .
(2)【问题探究】如图2,在Rt△ABC中,∠C=90°,BC=1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a24b71f64937b1848900d850372e1a.png)
(3)【问题解决】如图3,用边长为6的正方形纸片进行如下操作:对折正方形ABDE得折痕MN,连接EN,点A对应点H,得折痕CE,试说明:C是AB的黄金分割点;
(4)【拓展延伸】如图4,正方形ABCD中,M为对角线BD上一点,点N在边CD上,且CN<DN,当N为CD的黄金分割点时,∠AMB=∠ANB,连NM,延长NM交AD于E,请用相似的知识求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eefd4b2184d5660c6e44cfd2ee099d85.png)
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较难
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【推荐3】如图,在Rt△ABC中,∠C=90°,AC=6,BC=8,四边形PDEF是矩形,PD=2,PF=4,DE与AB边交于点G,点P从点B出发沿BC以每秒1个单位长的速度向点C匀速运动,伴随点P的运动,矩形PDEF在射线BC上滑动;点Q从点P出发沿折线PD﹣DE以每秒1个单位长的速度匀速运动.点P,Q同时出发,当点Q到达点E时停止运动,点P也随之停止.设点P,Q运动的时间是t秒(t>0)
(1)当t=1时,QD= ,DG= ;
(2)当点Q到达点G时,求出t的值;
(3)t为何值时,△PQC是直角三角形?
(1)当t=1时,QD= ,DG= ;
(2)当点Q到达点G时,求出t的值;
(3)t为何值时,△PQC是直角三角形?
![](https://img.xkw.com/dksih/QBM/2018/10/1/2043866577027072/2044414613446656/STEM/750a4aac-2cfb-4bc2-b42b-09e36b122d97.png)
您最近一年使用:0次