数学课上,李老师出示了这样一道题目:如图
,正方形
的边长为
,
为边
延长线上的一点,
为
的中点,
的垂直平分线交边
于
,交边
的延长线于
.当
时,
与
的比值是多少?
经过思考,小明展示了一种正确的解题思路:过
作直线平行于
交
,
分别于
,
,如图
,则可得:
,因为
,所以
.可求出
和
的值,进而可求得
与
的比值.
(1)请按照小明的思路写出求解过程.
(2)小东又对此题作了进一步探究,得出了
的结论.你认为小东的这个结论正确吗?如果正确,请给予证明;如果不正确,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8da45c443af7994a26ffa9d8894e7262.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4700db4caa77fdcfa7a2e19bc7dc5781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
经过思考,小明展示了一种正确的解题思路:过
![](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/9e52a8f07834cbbbe4224962672fbbb2.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5256200b9a4abc61456e47f4567d0ab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5ecbd1d80324aa86c222d5fe79fc9c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c5da44bd1537984418603aca93fc2e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b46c607b3deac746c0ef3389ad8f65c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4c865445dda4a59b6d5cb18fd74404.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/e0b850d8-42c7-4867-ac80-23284bc4f2c1.png?resizew=284)
(1)请按照小明的思路写出求解过程.
(2)小东又对此题作了进一步探究,得出了
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d191e1c2577c5f1375777676ce54111.png)
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更新时间:2019-01-30 18:14:09
|
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解答题-证明题
|
适中
(0.65)
【推荐1】在
中,
,
是
中点,
是
中点,过
作![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6095bae4840bfa80f2468f94b2002d7b.png)
;
(2)求证:四边形
是菱形;
(3)若
,
,求菱形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8008eab22184d57ef7d4258f2188f5c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6095bae4840bfa80f2468f94b2002d7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbce49533ed916bd1bc385875e1d7f8.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a5a2949b3d520ed03d57126c7d4d8d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8a7b5adfcac0f46a4cd19da4ebb4a2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94a5a2949b3d520ed03d57126c7d4d8d.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,在▱ABCD中,对角线AC,BD相交于点O,过点O作BD的垂线与边AD,BC分别交于点E,F,连接BE交AC于点K,连接DF.
![](https://img.xkw.com/dksih/QBM/2020/5/24/2469395681329152/2469622593667072/STEM/6ed64e74fd84499590aaca77a3275c2e.png?resizew=165)
(1)求证:四边形EBFD是菱形;
(2)若BK=3EK,AE=4,求四边形EBFD的周长.
![](https://img.xkw.com/dksih/QBM/2020/5/24/2469395681329152/2469622593667072/STEM/6ed64e74fd84499590aaca77a3275c2e.png?resizew=165)
(1)求证:四边形EBFD是菱形;
(2)若BK=3EK,AE=4,求四边形EBFD的周长.
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解答题-作图题
|
适中
(0.65)
【推荐1】如图,在
中,
请用尺规作图法,在
边上求作一点P,使得
.(保留作图痕迹,不写作法)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐2】如图,已知
.
(1)利用直尺和圆规,根据下列要求作图(保留作图痕迹,不要求写作法).
①作
的平分线
交
于点
;
②作线段
的垂直平分线交
于点
,交
于点
.
(2)在所作的图中,连接
、
.写出图中所有的等腰三角形:___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/cd03e6ff-cc97-4965-aa6b-8dfbe86c224d.png?resizew=153)
(1)利用直尺和圆规,根据下列要求作图(保留作图痕迹,不要求写作法).
①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
②作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)在所作的图中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】如图,将矩形
绕点
旋转得到矩形
,点
在
上,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/27/9bf3f5d0-7a0e-4d58-96d0-2f05c1c022ad.png?resizew=171)
(1)求证:
平分
;
(2)连接
交
于点
,点
是
的中点,连接
、
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
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![](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/2023/11/27/9bf3f5d0-7a0e-4d58-96d0-2f05c1c022ad.png?resizew=171)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4598486f8c5ac28b1165b76e78105979.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0fc232acd89fc499de346969ce8ced1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】在⊙O中,半径为
.
(1)如图一,若B为
上一个点(不与
、
重合),且
的度数为
,
①求
的度数;
②若
为弦
的中点,
为弦
的中点,求线段
的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/0fa9d59e-f2c4-42c5-bbbe-3ba31ebd99a7.png?resizew=184)
(2)如图二,若
的度数为
,
的度数为
,
的度数为
,点
为弦
的中点,点
为弦
的中点,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
(1)如图一,若B为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0ff808cf596294204a404d0a34f3e3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/0fa9d59e-f2c4-42c5-bbbe-3ba31ebd99a7.png?resizew=184)
(2)如图二,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c0927afc571a7c966c98192040979e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd6ffb78dad3375efa3b08ab518553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/18/87aff0b3-3694-45cd-8722-d79166817ce5.png?resizew=185)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,在Rt△ABC中,∠ACB=90°,AC=8,BC=6.点E从点A出发,沿AC以每秒1个单位长度的速度向终点C运动:点D从点C出发,沿C一B一A以每秒2个单位长度的速度向终点A运动,当点E停止运动时,点D随之停止,点E、D同时出发,设点E的运动时间为t(秒)
(1)用含t的代数式表示CE的长;
(2)设点D到CA的距离为h,用含t的代数式表示h;
(3)设△CDE的面积为S(平方单位),求S(平方单位)与t(秒)的函数关系式;
(4)当DE与△ABC的边平行或垂直时,直接写出t的值.
(1)用含t的代数式表示CE的长;
(2)设点D到CA的距离为h,用含t的代数式表示h;
(3)设△CDE的面积为S(平方单位),求S(平方单位)与t(秒)的函数关系式;
(4)当DE与△ABC的边平行或垂直时,直接写出t的值.
![](https://img.xkw.com/dksih/QBM/2020/1/4/2369597234102272/2370089682853888/STEM/a144fcf3c6a74720accba6d166eb75e6.png?resizew=147)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,DE∥BC,EF∥CG,AD:AB=1:3,AE=3.
![](https://img.xkw.com/dksih/QBM/2016/1/12/1573952850575360/1573952856768512/STEM/c21e3e94866f41daa1b967b9e8de9dc3.png)
(1)求EC的值;
(2)求证:AD•AG=AF•AB.
![](https://img.xkw.com/dksih/QBM/2016/1/12/1573952850575360/1573952856768512/STEM/c21e3e94866f41daa1b967b9e8de9dc3.png)
(1)求EC的值;
(2)求证:AD•AG=AF•AB.
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