已知点E是平行四边形ABCD边CD上的一点(不与点C,D重合).
![](https://img.xkw.com/dksih/QBM/2022/8/7/3039543520804864/3076872240857088/STEM/6dbd343555304774b24202586d43864d.png?resizew=554)
(1)如图1,当点E运动到CD的中点时,连接AE、BE,若AE平分∠BAD,证明:CE=CB.
(2)如图2,过点E作EF⊥DC交直线CB于点F,连接AF.若∠ABC=120°,BC=2
.若AB=4.在线段CF上是否存在一点H.使得四边形AFHD为菱形?若存在,请求出ED,CH的长;若不存在,请简单地说明理由.
![](https://img.xkw.com/dksih/QBM/2022/8/7/3039543520804864/3076872240857088/STEM/6dbd343555304774b24202586d43864d.png?resizew=554)
(1)如图1,当点E运动到CD的中点时,连接AE、BE,若AE平分∠BAD,证明:CE=CB.
(2)如图2,过点E作EF⊥DC交直线CB于点F,连接AF.若∠ABC=120°,BC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
21-22八年级下·湖北恩施·期末 查看更多[4]
湖北省恩施州巴东县2021-2022学年八年级下学期期末教学质量监测数学试题(已下线)专题9.48 矩形、菱形、正方形(存在性问题)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(苏科版)(已下线)专题18.46 矩形、菱形、正方形(存在性问题)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(人教版)(已下线)专题5.21 矩形、菱形、正方形(存在性问题)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(浙教版)
更新时间:2022-09-29 13:35:30
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解答题-证明题
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【推荐1】如图,平行四边形ABCD中,AB=BC=6cm,∠ADC=60°,点E从点D出发,以1cm/s的速度沿射线DA运动,同时点F从点A出发,以1cm/s的速度沿射线AB运动,连接CE、CF和EF,设运动时间为t(s).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/ebf7ffa2-e4fe-4c9a-bee7-b0ecb2ce9a5b.png?resizew=508)
(1)当t=3s时,连接AC与EF交于点G,如图①所示,则EF=________
;
(2)当E、F分别在线段AD和AB上时,如图②所示,
①求证:△CEF是等边三角形;
②连接BD交CE于点G,若BG=BC,求EF的长和此时的t值.
(3)当E、F分别运动到DA和AB的延长线上时,如图③所示,若EF=3
cm,直接写出此时t的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/14/ebf7ffa2-e4fe-4c9a-bee7-b0ecb2ce9a5b.png?resizew=508)
(1)当t=3s时,连接AC与EF交于点G,如图①所示,则EF=________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
(2)当E、F分别在线段AD和AB上时,如图②所示,
①求证:△CEF是等边三角形;
②连接BD交CE于点G,若BG=BC,求EF的长和此时的t值.
(3)当E、F分别运动到DA和AB的延长线上时,如图③所示,若EF=3
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180c9efbc1f04ec3336259832fc9c76b.png)
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【推荐2】如图,在菱形
中,
,
,点P从点A出发,沿线段
以每秒1个单位长度的速度向终点D运动,过点P作
于点O,作
交直线
于点M,交直线
于点F,设
与菱形
重叠部分图形的面积为S(平方单位),点P运动时间为t(秒).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/1192f58a-1ea5-4e37-9b8f-9d84700c2d8b.png?resizew=191)
(1)当点M与点B重合时,求t的值;
(2)当t为何值时,
与
全等;
(3)求S与t的函数关系式;
(4)以线段
为边,在
右侧作等边三角形
,当
时,请直接写出点E运动路径的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d84733f9dc908ceb11459cc2aed580ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a40b744f59a78172b82d3ea6a3216103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e99675fa03da205c4499967c9d908412.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/1192f58a-1ea5-4e37-9b8f-9d84700c2d8b.png?resizew=191)
(1)当点M与点B重合时,求t的值;
(2)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9763846b1131e1e3e2d741ad95d5bb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d493b4c84d8dc832e323a0bcd0db5589.png)
(3)求S与t的函数关系式;
(4)以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c4f9ce6fc0562eed85581a88f417be2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/849c17bd6fd63b1ca11138e55dd1544d.png)
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名校
【推荐1】在
中,
,
.
为线段
上一点,连接
,过点
作
交
延长线于点
,过点
作
交
于点
,若
,
,求
的长;
(2)如图2,点
在
内部,以
为斜边作等腰直角
,使得点
、
在
两侧,连接
,连接
交
于点
,点
在
上,连接
并延长交
于点
,若
,求证:
;
(3)如图3,过点
作
交
于点
,
为
上一点,以
为直角边作等腰直角
,斜边
交线段
于点
,
点和
点分别为线段
、线段
上的动点,连接
、
,将
沿着
翻折得到
,将
沿着
翻折得到
,若
,
,在线段
上找一点
,连接
、
,请直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2190970b1e2e397896d445b4138fe34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbfc332950d19764830174dba000b9bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a0268d04b9dea7629af27af9a0285a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f8b3d45ae1743416253d835c054456.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a459f78e4a3516d8a8535290ede7f386.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee74e36b8b6cc56b4ced2b718432db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b895eaf7d7ff23075155bf5c73dc675.png)
(3)如图3,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87cdf92058e29a5630a68a3edb60ccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67716ac738ee2911a69bf4063110a5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2588559c01596b7d95c3431ce2d14d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca3bd41676f6b69acac00a292fe134cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e320cf13cf44dcb3b734aa646eafa8c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08cce6cac0fdd4b1a434af8bcaec8fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10109d34ef06c3e721fd2c7128c5b9ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf2868930f8e12731ef57b175978cc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f97913e1af1e6c793f7edfe6b2114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dc02abb177009865910fab1098bfc00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc33ceb7769ec43b65583001e819196b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10109d34ef06c3e721fd2c7128c5b9ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b12ddd8d8afe1083a7f87714c73beaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d0245838b65c121f962eda78324ef63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b74e2b6dae540571fdd509c4e966b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eaa895fefcdf85fdc9165110a3f9c25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c795db8f22b7985bd2825e4293861a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a378b2cbb83b3e0a549a1ea858194414.png)
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【推荐2】如图,在
中,
为
的中点,
,
与
分别相交于点
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/28a3cf23-e69f-47d0-8615-b6f7f08b1a92.png?resizew=249)
(1)求
的值;
(2)若
,且
,
.求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/28a3cf23-e69f-47d0-8615-b6f7f08b1a92.png?resizew=249)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505abdb4631fe10cdcdde3dc3d6aad32.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e041b29c79d019eda0a5218078a3978d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4d14c6959273338a048b023805cce80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
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【推荐3】如图,矩形
中,
cm;
cm,若点P从点B出发沿BD方向,向点D匀速运动,同时点Q从点D出发沿DC方向,向点C匀速运动,它们的速度均为1cm/s,当P,Q两点中有一点到达终点时,另一点也随之停止运动.连接
,设运动时间为t(s),解答下列问题:
(1)则线段PD的长度为 (用含t的代数式表示);
(2)设
的面积为S,求
的面积S的最大值,并求出此时t的取值 .
(3)若将
沿QC翻折,得到四边形
,当四边形
为菱形时,求t的值;
(4)在点
的运动过程中,当t取何值时,
(直接写出t的值)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d19bb9bf36214529e20972e69cf18557.png)
(1)则线段PD的长度为 (用含t的代数式表示);
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52784d9fdfb3ec1f7bf8dcd2be73d96.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52784d9fdfb3ec1f7bf8dcd2be73d96.png)
(3)若将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ab2337ce84f6840194f67188285491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c534c83cd0bd3ca49ad2a83fb17fed0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c534c83cd0bd3ca49ad2a83fb17fed0.png)
(4)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1e11050f9706a5d2730eff38b0971c.png)
![](https://img.xkw.com/dksih/QBM/2019/4/1/2173126832824320/2178748682788864/STEM/be25050913ec4cf488bae7e405ab5976.png?resizew=148)
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【推荐1】已知,在四边形
中,
,
,连接
、
,如图1.
的度数;
(2)以
为对角线,
为边作
,如图2,试判断直线
与
的位置关系,并说明理由.
(3)在(2)的条件下,若
,
,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.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/8fabb884dc5f9609de491245463bbe9a.png)
(2)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25af54601cf1efc9cf647d65226f22f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a65b94de267eb6858634181642c65c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐2】在菱形
中,
,
,
两点分别在
,
边上,
.连接
,取
的中点
,连接
,
.
(1)依题意补全图1,并写出
的度数;
(2)用等式表示线段
与
的数量关系,并证明;
(3)若
,
,
的交点为
,连接
,
,四边形
能否成为平行四边形?若能,求出此时
的长;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34ec1827a09872159663c8d1998a0ff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb949f2a7ee89566c5c02b75043f6a3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/9/7fc29cb8-d0e0-4298-ad9e-d09d1fd80e62.png?resizew=464)
(1)依题意补全图1,并写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1de5869add51780a9de14c3d2afe9656.png)
(2)用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fb949f2a7ee89566c5c02b75043f6a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.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/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79bc313f73ba34b49cf9fd322d8835e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1933eccd8da4d75a5b0f8c893fe1bdf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,平面直角坐标系中,四边形
为矩形,点
坐标分别为
,动点
分别从
同时出发,以每秒1个单位的速度运动,其中点
沿
向终点
运动,点
沿
向终点
运动过动点
作
,交
于
,连接
,设
、
运动时间为
秒,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd20d1d5fbcf4cc7196a79b4105c700.png)
(1)当
秒时,
点的坐标为(____,____),
__________;
(2)当
为何值时,以
为顶点的三角形与
相似;
(3)在平面内是否存在一个点
,使以
为顶点的四边形是菱形,若存在,请直接写出
的值,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e71e34d9a5bab6a902aa326ca44df71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ffc62c28c53286cd17e9eb997af7221.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23020e4658a0175a7b79d5bee358dd68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ffc7d1af9053b027cf9e726f5367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd20d1d5fbcf4cc7196a79b4105c700.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/9/147b72c6-b2e7-470b-b166-e3fbbe2e5b3e.png?resizew=155)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66884efff7400f92b530d69d029778d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e7d551cca653e2d638c8cab4c2fda8.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594b542e9a73b2f6d38f0562546be602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)在平面内是否存在一个点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10759fa31fcf33867157409ef386dc6c.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】如图,矩形纸片
中,
,将纸片折叠,使顶点
落在边
上的
点,折痕的一端点
在边
上,
.
![](https://img.xkw.com/dksih/QBM/2019/8/30/2280004187316224/2280483579396096/STEM/40c40a46a1e44e7aa76f9460f8c88b2e.png?resizew=351)
(1)当折痕的另一端点
在
边上时,如图1,求
的面积.
(2)当折痕的另一端点
在
边上时,如图2,证明四边形
为菱形,并求出折痕
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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4b32b2a9a7f6db6f7e45de853a5bd9.png)
![](https://img.xkw.com/dksih/QBM/2019/8/30/2280004187316224/2280483579396096/STEM/40c40a46a1e44e7aa76f9460f8c88b2e.png?resizew=351)
(1)当折痕的另一端点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9756177ef0c7c685e0fc62077a1cd4e.png)
(2)当折痕的另一端点
![](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/c98af5bcdcd1f6b662e6e88224fc9d16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
您最近一年使用:0次