综合与实践
问题情境:数学活动课上,王老师出示了一个问题:
如图1,在
中,
,
,
是
上一点,连接
,过点
作
,垂足为
.求证:
.
实践探究:(2)在原有问题条件不变的情况下,王老师增加下面的条件,并提出新问题,请你解答.
“如图2,将线段
绕点
逆时针旋转,点
的对应点
在
的延长线上,连接
,过点
作
,交
于点
.猜想
与
的数量关系,并证明.”
问题解决:(3)数学活动小组同学对上述问题进行特殊化研究之后发现,当点
与点
重合,过点
作
,交
于点
时,若给出
的边长,则图3中所有已经同字母标记的线段长均可求.该小组提出下面的问题,请你解答.
“如图3,在(2)的条件下,若点
与点
重合,过点
作
,交
于点
,
,求
的长.”
问题情境:数学活动课上,王老师出示了一个问题:
如图1,在
![](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/047dc9795efa99b6fb9fdf9778085dab.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c897a54f2e36bc4b52fba74b41c89d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb86b208b14ff9ce2cdb91cd0ee499a7.png)
实践探究:(2)在原有问题条件不变的情况下,王老师增加下面的条件,并提出新问题,请你解答.
“如图2,将线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2bc4e15424fcbeb32b0916fff66332.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
问题解决:(3)数学活动小组同学对上述问题进行特殊化研究之后发现,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2df3ba97cd998f89ddaf9a510081b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
“如图3,在(2)的条件下,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2df3ba97cd998f89ddaf9a510081b85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
更新时间:2024-04-18 13:23:14
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】在平面直角坐标系中,已知点
,
.
(1)如图1,判断
的形状并说明理由;
(2)如图2,M,N分别是y轴负半轴和x轴正半轴上的点,且
,探究线段
,
,
之间的数量关系并证明;
(3)如图3,延长
交y轴于点C,M,N分别是x轴负半轴和y轴负半轴上的点,连接
交x轴于D,且
,探究
,
,
的数量关系并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f943121691740928470268b34781e06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bda45b7f565147f18a5c83bb8a23142.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/c2de19d4-d65d-431a-b329-d6d09734427b.png?resizew=528)
(1)如图1,判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
(2)如图2,M,N分别是y轴负半轴和x轴正半轴上的点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f59747cee312ee5140643428cae79efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88e9f7d1272b7344346b58b660aa260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
(3)如图3,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9078ca41ffdb1b4c12147ef3c3e6b8ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abb3c143721938422cde08e0690fac88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3bf347ee3990485027d58cb0805ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e244b5ab4d94b1b187b5eb86d5953e.png)
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解答题-问答题
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名校
【推荐2】如图1,在平面直角坐标系中,点
的坐标是
,点
的坐标是
.等腰
的顶点
在
轴正半轴.
(1)求直线
的解析式;
(2)如图2,点
为线段
上一动点,
为直线
上一点,连接
且满足
平行于
轴,连接
,求
面积取得最大值,并求出此时
的坐标;
(3)在第(2)问
面积取得最大值条件下,如图3,将
绕点
顺时针旋转得到△
,点
恰好落在直线
上,将△
沿着直线
平移得到△
,平移过程中是否存在某一时刻,使得△
是以
为腰的等腰三角形?若存在,请直接写出点
的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d5b2fee25cf53520f57c017e90e41f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8e32f16d75ccb62a04970f861827fca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6079e98cc72ed2765c0a65dfeec5131c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)如图2,点
![](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/60ef95894ceebaf236170e8832dcf7e3.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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0222d3ec99bc21b586b083bd9d67b225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(3)在第(2)问
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0222d3ec99bc21b586b083bd9d67b225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3304bc1372275307dce0bf4e98b8f3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99611740ec266f77e6cf19aa1f942b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f99611740ec266f77e6cf19aa1f942b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94254b2927d755dd24865ac0303342f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0f0cd34975d37a678cb0e05a7d1f1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fa4cbec2d523ec7ccc1ce95ea6ede8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://img.xkw.com/dksih/QBM/2021/8/18/2789020680847360/2799405370695680/STEM/265f3d99a7364c3c955f2073a2b875bd.png?resizew=684)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,在
中,
,
,点D是
边的中点,连接
,将线段
绕点D逆时针旋转
后得到线段
,
交
边于点G,过点C作
的平行线与过点E作的
的平行线交于点F,连接
交
于H,连接BE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/2/512ff470-d0ba-410a-8ad8-e68b077ec865.png?resizew=193)
(1)判断四边形
的形状并说明理由;
(2)当
时,请直接写出
的值;
(3)当
时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/877bcc8c03f24575f9e0f6b3c0e9c9a2.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/2/512ff470-d0ba-410a-8ad8-e68b077ec865.png?resizew=193)
(1)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95cd4e1c772aec3134e1a45fa95f421.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/013c11815e5162f294fd24abd04c73df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95cd4e1c772aec3134e1a45fa95f421.png)
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解答题-证明题
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较难
(0.4)
名校
【推荐2】如图,P 为矩形
的边
上一动点,
,将
绕点B顺时针旋转
得到
(点 P 的对应点为点
)连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/67e05d77-8588-449d-bd10-ec068a05c92a.png?resizew=144)
(1)求证:
;
(2)连接
,若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4876a481106f5d4909377275961b89f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86076e60d1727a012a0eab695dd6914f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/67e05d77-8588-449d-bd10-ec068a05c92a.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9a3935cd124d021c7b18b0f634915.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/599dac5b2243ebb2433592b9475cda28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b8e4da6c2580490e4e8d6465f4c3112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2af7bd9a49f355fa1cddd43af0ccfab.png)
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解答题-问答题
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较难
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【推荐3】如图1,在平面直角坐标系中,
,
,现同时将点
,
分别向上平移
个单位,再向右平移
个单位,分别得到点
,
的对应点
,
,且
点落在
轴上,连接
,
.
、
的坐标:
,
;
(2)如图1,若点
在线段
上,且
,点
以每秒
个单位长度的速度从点
沿
轴正半轴向上运动,是否存在点
,使得
,若存在,求出点
的坐标;若不存在,请说明理由;
(3)如图2,已知
,射线
以
的速度绕点
顺时针旋转至
停止,射线
以
的速度绕点
顺时针旋转,射线
、
同时开始旋转,同时停止运动.在射线
到达
之前,会与射线
交于点
,过
作
交
于
,则在转动过程中,
的值是否会改变,如果不变请求出这个定值;如果会变,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ba1df94176a1f769c7a0a12bf357fb.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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ccecddacc80dc992f3be048cb68fd3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbeb1dbb8fe372dbd390958f853b7412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa858b7c23b77ab2647e01ae4ad57fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3569a84395a87aac0837f0725d717639.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e0b41cd45fba881194a02ec19bc26e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719c90fd4a4edeaa6b7d64f9f637cfe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/ea3fc5128f73d916a23695f49333e591.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe2f604091e9667da0974976a5b7ce1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f835b4ace21d56aff1c94382bd81091.png)
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解答题-证明题
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名校
【推荐1】如图,△ABC中,AB=AC,AD⊥BC于D,E是AC边上一点,⊙O过B、D、E三点,分别交AC、AB于点F、G,连接EG、BF分别与AD交于点M、N;
(1)求证:∠AMG=∠BND;
(2)若点E为AC的中点,求证:BF=BC;
(3)在(2)的条件下,作EH⊥EG交AD于点H,若EH=EG=4
,过点G作GK⊥BF于点K,点P在线段GK上,点Q在线段BK上,连接BP、GQ,若∠KGQ=2∠GBP,GQ=15
,求GP的长度.
(1)求证:∠AMG=∠BND;
(2)若点E为AC的中点,求证:BF=BC;
(3)在(2)的条件下,作EH⊥EG交AD于点H,若EH=EG=4
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b12efb03327f461e868b2ea433f9b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2020/3/8/2414954470711296/2415279022047232/STEM/8f3456b43eed44b69ecbdab369807308.png?resizew=517)
您最近一年使用:0次
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解题方法
【推荐2】【基础巩固】
(1)如图1,在△ABC中,∠ACB=90°,分别过A、B两点作AE⊥l,BD⊥l,垂足分别为E、D,求证:△BDC∽△CEA;
【尝试应用】
(2)如图2,在△ABC中,∠ACB=90°,过D作AD的垂线交AB于点E.若BE=DE,tan∠BAD=
,AC=20,求BD的长.
【拓展提高】
(3)如图3,在▱ABCD中,在BC上取点E,若∠AED=90°,AE=AB,
=
,CD=
,求
的面积.
(1)如图1,在△ABC中,∠ACB=90°,分别过A、B两点作AE⊥l,BD⊥l,垂足分别为E、D,求证:△BDC∽△CEA;
【尝试应用】
(2)如图2,在△ABC中,∠ACB=90°,过D作AD的垂线交AB于点E.若BE=DE,tan∠BAD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
【拓展提高】
(3)如图3,在▱ABCD中,在BC上取点E,若∠AED=90°,AE=AB,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8915a3686bd9b0e04223907bf56e89ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d599cb4a589f90b0205f24c2e1fa021e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01961669cd597f61fa48e9853d678bb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932746577518592/2961194282663936/STEM/cef45c6c-b146-4fea-a5f4-e6a5ef284994.png?resizew=561)
您最近一年使用:0次
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【推荐1】如图,△ABC内接于⊙O,且AB=AC,
(1)⊙O的弦AE交于BC于D.求证:AB•AC=AD•AE;
(2)在(1)的条件下当弦AE的延长线与BC的延长线相交于点D时,上述结论是否还成立?若成立,请给予证明.若不成立,请说明理由.
(3)已知⊙O 的半径2,∠ACB=40°,求BA的长.(sin40°≈0.64,cos40°≈0.77,tan40°≈0.84,结果精确到0.1)
(1)⊙O的弦AE交于BC于D.求证:AB•AC=AD•AE;
(2)在(1)的条件下当弦AE的延长线与BC的延长线相交于点D时,上述结论是否还成立?若成立,请给予证明.若不成立,请说明理由.
(3)已知⊙O 的半径2,∠ACB=40°,求BA的长.(sin40°≈0.64,cos40°≈0.77,tan40°≈0.84,结果精确到0.1)
![](https://img.xkw.com/dksih/QBM/2017/6/2/1700294083895296/1700823560265728/STEM/158cacab728c4a89915430cd69ee1eb6.png?resizew=458)
您最近一年使用:0次
解答题-问答题
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较难
(0.4)
【推荐2】问题探究:
(1)如图①,已知等边△ABC,边长为4,则△ABC的外接圆的半径长为 .
(2)如图②,在矩形ABCD中,AB=4,对角线BD与边BC的夹角为30°,点E在为边BC上且BE=
BC,点P是对角线BD上的一个动点,连接PE,PC,求△PEC周长的最小值.
问题解决:
(3)为了迎接新年的到来,西安城墙举办了迎新年大型灯光秀表演.其中一个镭射灯距城墙30米,镭射灯发出的两根彩色光线夹角为60°,如图③,若将两根光线(AB,AC)和光线与城墙的两交点的连接的线段(BC)看作一个三角形,记为△ABC,那么该三角形周长有没有最小值?若有,求出最小值,若没有,说明理由.
(1)如图①,已知等边△ABC,边长为4,则△ABC的外接圆的半径长为 .
(2)如图②,在矩形ABCD中,AB=4,对角线BD与边BC的夹角为30°,点E在为边BC上且BE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
问题解决:
(3)为了迎接新年的到来,西安城墙举办了迎新年大型灯光秀表演.其中一个镭射灯距城墙30米,镭射灯发出的两根彩色光线夹角为60°,如图③,若将两根光线(AB,AC)和光线与城墙的两交点的连接的线段(BC)看作一个三角形,记为△ABC,那么该三角形周长有没有最小值?若有,求出最小值,若没有,说明理由.
![](https://img.xkw.com/dksih/QBM/2019/6/2/2216817931173888/2217868376662016/STEM/b2dcdc2529084a9fbcbc48a326709d21.png?resizew=415)
您最近一年使用:0次