如图,
的对角线
交于点O,过点D作
于E,延长
到点F,使
,连接
.
是矩形.
(2)若
,试求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c55ee522f41c43253050e92b3c8de31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ee570308b514c54ab88e7f4579c3b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89e9785a8ffb637c91757fe01d3c23a5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96ef7692e6039788dcdf28f3f39c7b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
2020·四川南充·一模 查看更多[18]
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更新时间:2023-02-19 18:24:30
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解答题-证明题
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【推荐1】如图,在
中,
于点
,
于点
,交
于点
.
![](https://img.xkw.com/dksih/QBM/2023/1/9/3149177601327104/3165474685943808/STEM/185b62d8377240f684310d95e6d07760.png?resizew=150)
(1)求证:
.
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2543ed4fa5196e938d251d8332bdc7a.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2023/1/9/3149177601327104/3165474685943808/STEM/185b62d8377240f684310d95e6d07760.png?resizew=150)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/258a402a711d3ec78299678e37067e84.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e45a84143b2416018b3d2299baf2bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐2】如图,在正方形
中,点
、
在对角线
上,且
,
(1)求证:四边形
是菱形.
(2)若
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03687d97d61b4a7cecbb73f2a6604212.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/7/2a0edc5e-d5d1-4e69-b2b5-6ec1f7ec4f64.png?resizew=151)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4280be91682e5d8a0d0704190319bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
您最近一年使用:0次
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【推荐1】如图,在
中,对角线
与
相交于点
,点
,
在
上,且
,连接
,
,
,
.
,则可证明四边形
是矩形,请帮他完成证明.
(2)在(1)条件下,且
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3aa1da9eef031c9562154530cbafb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
(2)在(1)条件下,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c3b184adb06f96bacedc27c6b21b6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f2cdf5fcb101da7e0a95ab443be2e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
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【推荐2】在
中,对角线
交于点O,过点O作
,交
于点E,交
于点F,连接
.
是菱形;
(2)如图2,
,请直接写出图中的所有等边三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d578394cd8e4d7a705599269c512960.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c672f693a7e75a7bae4936dcb1920430.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/ca7b50da9fef51f37b4813746d77a33a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bdae3d30abf70515bdbd45f9d0c380.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a015a6a468b212fd3fd27e96a7ccf35f.png)
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解答题-证明题
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【推荐1】如图,平行四边形
的对角线
,
相交于点O,E,F分别是
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/0d6d9777-43ef-4a79-8c4f-73aa49c463e5.png?resizew=243)
(1)求证:四边形
是平行四边形;
(2)若
,
.
①求
的长;
②求
的长.
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb792226b4cad5074e4d2d646add328b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8050d4948ec849d03ccba785d432067.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/6/0d6d9777-43ef-4a79-8c4f-73aa49c463e5.png?resizew=243)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c4559d27e3905980d1a4f1856f07de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8db33f8c458c9fc0e35f5b1df4843ba.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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解答题-作图题
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【推荐2】如图,在
中,
,求
的长.(提示:作出
边上的高,借助
的面积求解).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6e1f34f75f8fa33a8b2560f0bf03bc.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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2021/10/12/2827616788766720/2827668067434496/STEM/30ad5e55-d67a-46c9-8900-0c7dafc20fb5.png?resizew=164)
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解答题-问答题
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【推荐1】已知:如图,在矩形ABCD中,AC是对角线,AB=4cm,BC=3cm.点P从点A出发,沿AC方向匀速运动,速度为1cm/s,同时,点Q从点B出发,沿BA方向匀
逨运动,速度为1cm/s,过点P作PM⊥AD于点M,连接PQ,设运动时间为t(s)
(0<t<4).解答下列问题:
![](https://img.xkw.com/dksih/QBM/2016/4/20/1574195174277120/1574195180306432/STEM/2ac35e585f8c4e5abcc67ac9cd0d9a16.png)
(1)当t为何值时,四边形PQAM是矩形?
(2)是否存在某一时刻t,使S四边形PQAM=
S矩形ABCD?若存在,求出t的值;若不存在,请说明理由.
(3)当t为何值时,△APQ与△ABC相似?
逨运动,速度为1cm/s,过点P作PM⊥AD于点M,连接PQ,设运动时间为t(s)
(0<t<4).解答下列问题:
![](https://img.xkw.com/dksih/QBM/2016/4/20/1574195174277120/1574195180306432/STEM/2ac35e585f8c4e5abcc67ac9cd0d9a16.png)
(1)当t为何值时,四边形PQAM是矩形?
(2)是否存在某一时刻t,使S四边形PQAM=
![](https://img.xkw.com/dksih/QBM/2016/4/20/1574195174277120/1574195180306432/STEM/55f2e83f13b54ee8b7ffc5107cf1940a.png)
(3)当t为何值时,△APQ与△ABC相似?
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【推荐2】已知矩形ABCD,其中AD>AB,依题意先画出图形,然后解答问题.
(1)F为DC边上一点,把△ADF沿AF折叠,使点D恰好落在BC上的点E处.在图1中先画出点E,再画出点F,若AB=8,AD=10,直接写出EF的长为 ;
(2)把△ADC沿对角线AC折叠,点D落在点E处,在图2先画出点E,AE交CB于点F,连接BE.求证:△BEF是等腰三角形.
(1)F为DC边上一点,把△ADF沿AF折叠,使点D恰好落在BC上的点E处.在图1中先画出点E,再画出点F,若AB=8,AD=10,直接写出EF的长为 ;
(2)把△ADC沿对角线AC折叠,点D落在点E处,在图2先画出点E,AE交CB于点F,连接BE.求证:△BEF是等腰三角形.
![](https://img.xkw.com/dksih/QBM/2020/2/2/2390152322826240/2390998516441088/STEM/e0056525eac24a95ba73af43ec288c04.png?resizew=243)
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