综合与实践
问题情境:(1)在综合与实践活动课上,老师出示了一个问题.
如图1,将平行四边形纸片
折叠,使得点
与点
重合,折痕为
,展开后,连接
,
.试探究四边形
的形状,并说明理由.
独立思考:请解答老师提出的问题.
实践探究:(2)“希望小组”受此问题的启发,如图2,将平行四边形纸片
改为矩形纸片
,然后将矩形纸片
沿着折痕
折叠,使点
与点
重合,点
落在点
处,展开铺平,连接
,若
,求折痕
的长.
解决问题:(3)“智慧小组”突发奇想,如图3,将平行四边形纸片
沿着
折叠,连接
,若点
的对应点
恰好落在
上,展开铺平,连接
,当
时,直接写出
的长.
问题情境:(1)在综合与实践活动课上,老师出示了一个问题.
如图1,将平行四边形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
独立思考:请解答老师提出的问题.
实践探究:(2)“希望小组”受此问题的启发,如图2,将平行四边形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d79996b7c907af3122cba3f37504bce5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
解决问题:(3)“智慧小组”突发奇想,如图3,将平行四边形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943712a5e96b16cc15d775cc4687237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f9dc909cf022530048243e1d46a253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
更新时间:2024-05-08 14:51:46
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图①,在
ABC中,∠ACB=90°,∠ABC=30°,AC=1,D为
ABC内部的一动点(不在边上),连接BD,将线段BD绕点D逆时针旋转60°,使点B到达点F的位置;将线段AB绕点B顺时针旋转60°,使点A到达点E的位置,连接AD,CD,AE,AF,BF,EF.
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876344246476800/2919103100043264/STEM/6c30d52d-c7b3-4601-b84f-5bed6470b58c.png?resizew=347)
(1)求证:
BDA≌
BFE;
(2)当CD+DF+FE取得最小值时,求证:AD
BF.
(3)如图②,M,N,P分别是DF,AF,AE的中点,连接MP,NP,在点D运动的过程中,请判断∠MPN的大小是否为定值.若是,求出其度数;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/12/20/2876344246476800/2919103100043264/STEM/6c30d52d-c7b3-4601-b84f-5bed6470b58c.png?resizew=347)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(2)当CD+DF+FE取得最小值时,求证:AD
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
(3)如图②,M,N,P分别是DF,AF,AE的中点,连接MP,NP,在点D运动的过程中,请判断∠MPN的大小是否为定值.若是,求出其度数;若不是,请说明理由.
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名校
【推荐2】【问题情境】
【尝试应用】
(2)如图2,正方形网格中,点A,B,C,D为格点,AB交CD于点O.求tan∠AOC的值;
【拓展提升】
(3)如图3,点P是线段AB上的动点,分别以AP,BP为边在AB的同侧作正方形APCD与正方形PBEF,连接DE分别交线段BC,PC于点M,N.
①求∠DMC的度数;
②连接AC交DE于点H,直接写出
的值.
【尝试应用】
(2)如图2,正方形网格中,点A,B,C,D为格点,AB交CD于点O.求tan∠AOC的值;
【拓展提升】
(3)如图3,点P是线段AB上的动点,分别以AP,BP为边在AB的同侧作正方形APCD与正方形PBEF,连接DE分别交线段BC,PC于点M,N.
①求∠DMC的度数;
②连接AC交DE于点H,直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef9c29abd53456f9beb7bc56273e85bb.png)
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【推荐1】综合与实践课上,老师让同学们以“图形的折叠与变换”为主题开展数学活动.
操作一:如图1,将矩形纸片
折叠,使
落在边
上,点
与点
重合,折痕为
.
根据以上操作:四边形
的形状是 ;
操作二:沿
剪开,将四边形
折叠,使边
都落在四边形的对角线
上,折痕为
,连接
,如图2.
根据以上操作:
的度数为 ,线段
的数量关系是 .
(2)迁移探究
如图3,在
上分别取点
,使
和图
中的
相等,连接
,探究线段
之间的数量关系,并说明理由.
(3)拓展应用
在(2)的探究下,连接对角线
,若图
中的
的边
分别交对角线
于点
,将纸片沿对角线
剪开,如图
,若
,
,直接写出
的长.
操作一:如图1,将矩形纸片
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
根据以上操作:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bedde879f99aed69d745d5ec8fe62084.png)
操作二:沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bedde879f99aed69d745d5ec8fe62084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/646ee29654f8211748b5a5c976b92d1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/026afd9e84a096df8ac1d76494c67cb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
根据以上操作:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936af8bf3f3ed7a2d40e1211860fc347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdd8fb58db0a7a6870ea547a8f41225f.png)
(2)迁移探究
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b75f959ed3224c89a1f6ea90fb4920.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd779e96d5ecbda1aa842c163c2eed1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d2d4aa39abfb9bf99ec7ffd6a1dbe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/936af8bf3f3ed7a2d40e1211860fc347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71432131d194730a67f3192d1f8679b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9593b13f36ee190a3dfdf070297e8d2c.png)
(3)拓展应用
在(2)的探究下,连接对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06d2d4aa39abfb9bf99ec7ffd6a1dbe6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b8b5b45abab468a3772f3917ec95d3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8dee74c7687e3e7c45f10299af6ffe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79a236e6039ccf4567769b06baa6137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2b041423973adf7fe20d6e63c278d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c6163af13c0277bc633fc9b4a83700.png)
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解答题-证明题
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解题方法
【推荐2】矩形
中,
,
,将矩形折叠,使点
落在点
处,折痕为
.
(1)如图1,若点
恰好在边
上.
①求证:
;
②求
的长;
(2)如图2,若
是
的中点,
的延长线交
于点
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bdf82f2b3ac77ee7b9b35aebe0dd83f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96cbd1ff21afbcfd7455e417403fb80c.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.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/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://img.xkw.com/dksih/QBM/2021/1/13/2635020683935744/2635241193881600/STEM/9d52b994f8124f3f82770df7fd7bde13.png?resizew=329)
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解答题-证明题
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较难
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【推荐1】【初步感知】
(1)如图①,在
中,点
为
上一点,连接
并延长交
的延长线于点
,若
,求证:点
是
的中点;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/59a9fce6-c84b-4d74-9bbe-9834cd59a503.png?resizew=206)
【探究运用】
(2)如图②,在四边形
中,
,
,
,
,点
是
的中点,且
,
、
的延长线相交于点
,求证四边形
是菱形,并求
的长;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/3db4efed-1aa9-4fcc-87af-eb29b0f0ab0a.png?resizew=153)
【实际运用】
(3)如图③,某小区内有一块三角形区域
,在
边的中点
处修建一个公共卫生间,在
边上确定一点
,使得
,修两条笔直的小路
和
,在其交汇处
修一凉亭(凉亭大小忽略不计),已知凉亭到
处的距离为200米(即
米),求凉亭到
处的距离
.
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e7cee4031f638f6fdb03f93e685572a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/59a9fce6-c84b-4d74-9bbe-9834cd59a503.png?resizew=206)
【探究运用】
(2)如图②,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce0d7095ddd69d6ceaf1065b1bc2c79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.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/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.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/211c130e20ea36d96e88927f88df956e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/3db4efed-1aa9-4fcc-87af-eb29b0f0ab0a.png?resizew=153)
【实际运用】
(3)如图③,某小区内有一块三角形区域
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2bb81f4812ca2308483e34c1bc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/d2b99c8273154bff8cf73358fee3956f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/27/e9521672-a857-487f-aa6f-29ca7d812c02.png?resizew=161)
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解答题-问答题
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较难
(0.4)
【推荐2】如图在△ABC中,∠CAB=
,AD是BC边上的中线,E是AD的中点,过点A作BC的平行线,交BE的延长线于点F,连接CF,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/50c86b72-aa07-461e-bfd1-9d0ac5a81112.png?resizew=193)
(1)试判断四边形ADCF的形状,并说明理由.
(2)若四边形ADCF是正方形,BF与AE有什么数量关系?说明理由.
(3)若AC=6,AB=8,求BF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/14/50c86b72-aa07-461e-bfd1-9d0ac5a81112.png?resizew=193)
(1)试判断四边形ADCF的形状,并说明理由.
(2)若四边形ADCF是正方形,BF与AE有什么数量关系?说明理由.
(3)若AC=6,AB=8,求BF的长.
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1】如图,在
中,
,
,
,
是边
的中点,动点
从点
出发,以每秒4个单位长度的速度沿
向终点
运动,过点
作
于点
,当点
不与点
、
、
重合时,以
、
为邻边作
,设点
的运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/644db33d-3d45-4fae-b314-43f31ae709d9.png?resizew=200)
(1)用含有t的代数式表示线段
的长.
(2)当点
到点
、
的距离相等时,求
的长.
(3)当
的某条对角线与边
垂直时,求t的值.
(4)作点
关于直线
的对称点
,连结
,当
时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58196842483577dbc6be9bc873651d2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.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/dad2a36927223bd70f426ba06aea4b45.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b154270249b0ef54ddb26137b2681a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d544c6eb82af1e6d94c358ec90dc27c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/3/644db33d-3d45-4fae-b314-43f31ae709d9.png?resizew=200)
(1)用含有t的代数式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d544c6eb82af1e6d94c358ec90dc27c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(4)作点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4ca80c5dcdc6c8e3c5065462a9a2e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c1a74a631964c7f6a2df0c6bbbce2fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】在平面直角坐标系xoy中, 一块含60°角的三角板作如图摆放,斜边AB在x轴上,直角顶点C在y轴正半轴上,已知点A(-1,0).
(1)请直接写出点B、C的坐标:B( , )、C( , );并求经过A、B、C三点的抛物线解析式;
(2)现有与上述三角板完全一样的三角板DEF(其中∠EDF=90°,∠DEF=60°),把顶点E放在线段AB上(点E是不与A、B两点重合的动点),并使ED所在直线经过点C. 此时,EF所在直线与(1)中的抛物线交于第一象限的点M.连接MB和MC,当△OCE∽△OBC时,判断四边形AEMC的形状,并给出证明;
(3)有一动点P在(1)中的抛物线上运动,是否存在点P,以点P为圆心作圆能和直线AC和x轴同时相切 ,若存在,求出圆心P的坐标;若不存在,请说明理由.
(1)请直接写出点B、C的坐标:B( , )、C( , );并求经过A、B、C三点的抛物线解析式;
(2)现有与上述三角板完全一样的三角板DEF(其中∠EDF=90°,∠DEF=60°),把顶点E放在线段AB上(点E是不与A、B两点重合的动点),并使ED所在直线经过点C. 此时,EF所在直线与(1)中的抛物线交于第一象限的点M.连接MB和MC,当△OCE∽△OBC时,判断四边形AEMC的形状,并给出证明;
(3)有一动点P在(1)中的抛物线上运动,是否存在点P,以点P为圆心作圆能和直线AC和x轴同时相切 ,若存在,求出圆心P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2017/6/2/1700294083895296/1700823560364032/STEM/50acfab5e79943efac7934c9eae43df9.png?resizew=454)
您最近一年使用:0次