如图,已知直线y=kx+8的与x轴正半轴交于点A,与y轴交于点B,点C 在x轴负半轴上,直线y=x+b经过点C,直线y=x+b与直线AB交于点E,线段OA,OC的长满足
.
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501571397697536/2502919861051392/STEM/3298f33157f74f38b9e73aa40fe0ee35.png?resizew=238)
(1)求OA,OC的长;
(2)求点E的坐标;
(3)若点P在x轴上,在平面内是否存在点Q,使以C,E,P,Q为顶点的四边形是菱形?若存在,直接写出点Q的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06f02fe2bded0c2ac1632b0d070ace23.png)
![](https://img.xkw.com/dksih/QBM/2020/7/8/2501571397697536/2502919861051392/STEM/3298f33157f74f38b9e73aa40fe0ee35.png?resizew=238)
(1)求OA,OC的长;
(2)求点E的坐标;
(3)若点P在x轴上,在平面内是否存在点Q,使以C,E,P,Q为顶点的四边形是菱形?若存在,直接写出点Q的坐标;若不存在,说明理由.
更新时间:2020-07-10 15:46:24
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解答题-问答题
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【推荐1】已知:
,c比b大2.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/a5304f71-e81b-4144-b770-7125b03a7543.png?resizew=483)
(1)
______,
______,
______.
(2)在数轴上,点A,B,C分别对应实数a,b,c.
①数轴上点P到点A的距离是点P到点B的距离的2倍,求点P对应的数.
②动点M从点A出发以4个单位速度向右运动,动点N从点B出发以1个单位速度向右运动,点D在数轴上对应的数是10,动点M与动点N同时出发,当M运动到D后立即以原来的速度向左运动,当点M到达出发点A时,两个动点同时停止运动,设运动时间是t,当
______时,M、N两点到点C的距离相等(直接写出t的值).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2468f9eced6e0c1eabeccaa5d8e995e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/a5304f71-e81b-4144-b770-7125b03a7543.png?resizew=483)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4e9bb42376c12d7d21702ae8062b25a.png)
(2)在数轴上,点A,B,C分别对应实数a,b,c.
①数轴上点P到点A的距离是点P到点B的距离的2倍,求点P对应的数.
②动点M从点A出发以4个单位速度向右运动,动点N从点B出发以1个单位速度向右运动,点D在数轴上对应的数是10,动点M与动点N同时出发,当M运动到D后立即以原来的速度向左运动,当点M到达出发点A时,两个动点同时停止运动,设运动时间是t,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
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【推荐2】如图,在数轴上有
三点,分别表示有理数
,
,
,且
,
,
满足式子
;如图:动点
从点
出发,以2个单位/秒的速度一直向右运动,点
运动5秒后,长度为6个单位的线段
(
为线段左端点且与点
重合,
为线段右端点)从
点出发以3个单位/秒的速度向右运动,当点
到达点
后,线段
立即以同样的速度返回向左运动,当点
到达点
后线段
再以同样的速度向右运动,如此往返.设点
运动时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/535fde62-9a95-4abd-a951-379b4eb60d29.png?resizew=424)
(1)求
,
,
的值;
(2)当
______秒时,点
与点
重合,并求出此时线段
上点
所表示的数;
(3)记线段
的中点为
,在运动过程中,当点
与点
的距离为1个单位时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38335830b93ac4d99c28a8e209eecb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/855cffbc3b3891ca57ab7457e0480c7c.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/2022/12/7/535fde62-9a95-4abd-a951-379b4eb60d29.png?resizew=424)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
(3)记线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐3】已知数轴上
,
两点表示的数分别为
,
,且
,
满足
.
(1)直接写出
和
的值;
(2)若点
表示的数为4,点
,
分别从
,
两处同时出发相向匀速运动,点
的速度为5个单位长度/秒,点
的速度为3个单位长度/秒,设两点运动时间为
秒:
①当点
在
,
之间,且
时,求出此时
的值;
②当点
运动到点
时,立刻以原来的速度返回,到达点
后停止运动;当点
运动到点
时,立刻以原来速度返回,到达点
后再次以相同速度返回向
点运动,如此在
,
之间不断往返,直至点
停止运动时,点
也停止运动.求在此运动过程中,
,
两点相遇时
的值.
![](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/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bbb33a7f3b98946e7dcd1e8c93e4e5a.png)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若点
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
①当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/972a7fad30d9b67df132ac00fec2e9a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
②当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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名校
【推荐1】如图1,在平面直角坐标系中,已知
,且满足
,线段
交y轴于点F.
(1)填空:
,
;
(2)如图1,在x轴上求点P,使得
的面积与
的面积相等.
(3)如图2,点D为y轴正半轴上一点,
,且
分别平分
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7051776fe6827a0a032b598210cc0080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59a19cf172e1fade3c1134413d02440b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/5/799b8af4-1c20-47f1-a5a4-860cb18ae581.png?resizew=323)
(1)填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7277696e8d9f58c9ec28887783b317e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1dbed0813c67a81a3a76c288a3f105.png)
(2)如图1,在x轴上求点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(3)如图2,点D为y轴正半轴上一点,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60fe9421954bd2a0d39cf229d32ef19c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1be7962898409b503e231541bf97e8cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b4b41fc2c2b8bb2332b1bb60e936791.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5071953255f6434eaefeab7176372564.png)
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【推荐2】已知:如图1.在平面直角坐标系中,C在第二象限内的一点,
轴于A,
,且满足
,点P在
的平分线上,Q在x轴上.
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/e9e9db5f-1142-44cd-8d9d-6eccae3889be.png?resizew=317)
(1)求a,b的值;
(2)若
,求证:
;
(3)如图2,在y轴正半轴上取点B,使得
,
为第四象限上一点,过点D作x轴、y轴的垂线交直线
于G、H两点,当m,n满足什么关系时,
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54aa84d529d5dae2904a1be24edbe3dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad0f00d7f0acc53d9774923580a60bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af0250886a6729993814d2e7cdb81d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c84c9ffbc195176d8613dbf9c8ea605.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/5/e9e9db5f-1142-44cd-8d9d-6eccae3889be.png?resizew=317)
(1)求a,b的值;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79684a6e92297749c005e2b23cac9710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c737ff07c8ebdb8c63067ba9da15b6b7.png)
(3)如图2,在y轴正半轴上取点B,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/518dfce0a9aab04171383586c5077146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dadbb3797d1667507809ff275c5b947.png)
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【推荐1】如图1所示,直线l:
与x轴负半轴、y轴正半轴分别交于
两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/9b249781-e4b1-4170-b225-a055d34845c9.jpg?resizew=543)
(1)当
时,求点A坐标及直线l的解析式;
(2)在(1)的条件下,如图2所示,设Q为
延长线上的一点,作直线
,过
两点分别作
于M,
于N,若
,求
的长.
(3)当m取不同值时,点B在y轴正半轴上运动,分别以
为边,点B为直角顶点在第一、二象限内作等腰直角
和等腰直角
,连接
交y轴于点P,如图3,问:当点B在y轴正半轴上运动时,试猜想
的长度是否为定值?若是,请求出其值;若不是,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efbf63b5a7caf0436c6bf6d97dc8b47d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/2/9b249781-e4b1-4170-b225-a055d34845c9.jpg?resizew=543)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
(2)在(1)的条件下,如图2所示,设Q为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0009063fe00277645aff1be6e32471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c21ada1be6bb7f4ffd9dde9fc81aa7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b8fc6401fa904347af60bfdeec37f8d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5277db1fee83e4d30efa713d25e2c206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
(3)当m取不同值时,点B在y轴正半轴上运动,分别以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d891ebcb02990983cc38f924295492c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3954beda5772eb8d5de1002ddeb81524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
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【推荐2】对于平面直角坐标系
中的点M,N和图形W,给出如下定义:若图形W上存在一点P,使得
,且
,则称点M为点N关于图形W的一个“旋垂点”
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/aa77d0ee-d11f-458f-8e86-5e87edea1f03.png?resizew=310)
(1)已知点
,
,
①在点
中,是点O关于点A的“旋垂点”的是___________;
②若点
是点O关于线段
的“旋垂点”,求m的取值范围;
(2)直线
与x轴,y轴分别交于C,D两点,
的半径为
,圆心为
,若在
上存在点P,线段
上存在点Q,使得点Q是点P关于
的一个“旋垂点”,且
,直接写出t的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c17d74d4486a02bec29f7f559e837661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a548388b88b57099b260c9ecfaffda0d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/aa77d0ee-d11f-458f-8e86-5e87edea1f03.png?resizew=310)
(1)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/622d475f7785b71633f058e6da3c7d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9330c732503981057e9ea92d5319f0f.png)
①在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defc4f730dccd4ed784d6f47be4ffc0e.png)
②若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c17f192f039cae8e876c335882997f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/501a6d50c937729c8d0f02b2b62a0ee4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/862a5ffc6b7be4766713010c734f3720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9347ab0d001ed7e8f51f9886ce88ac64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/187c4fdbdcafe2dd605005adecbb34dc.png)
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【推荐1】如图,在Rt△ABC中,∠B=90°,AC=60cm,∠A=60°,点D从点C出发沿CA方向以4cm/s的速度向点A匀速运动,同时点E从点A出发沿AB方向以2cm/s的速度向点B匀速运动,当其中一个点到达终点时,另一个点也随之停止运动.设点D、E运动的时间是ts.过点D作DF⊥BC于点F,连接DE、EF.
(1)用t的代数式表示:AE= ;DF= ;
(2)四边形AEFD能够成为菱形吗?如果能,求出相应的t值;如果不能,请说明理由;
(3)当t为何值时,△DEF为直角三角形?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/14/ea4dbaa5-2f49-415c-97be-135cf6b4b377.jpg?resizew=149)
(1)用t的代数式表示:AE= ;DF= ;
(2)四边形AEFD能够成为菱形吗?如果能,求出相应的t值;如果不能,请说明理由;
(3)当t为何值时,△DEF为直角三角形?请说明理由.
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【推荐2】如图,在矩形ABCD中,AB=2,
,G,H分别是AD,BC边上的点,且AG=CH,E,O,F分别是对角线BD上的四等分点,顺次连接G,E,H,F,G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/2f5cb652-3b42-41eb-8715-ba50c61e31d5.png?resizew=186)
(1)求证:四边形GEHF是平行四边形;
(2)填空:①当AG= 时,四边形GEHF是矩形;②当AG= 时,四边形GEHF是菱形;
(3)求四边形GEHF的周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03366e8ad89bbf52a24243e94646fc7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/2f5cb652-3b42-41eb-8715-ba50c61e31d5.png?resizew=186)
(1)求证:四边形GEHF是平行四边形;
(2)填空:①当AG= 时,四边形GEHF是矩形;②当AG= 时,四边形GEHF是菱形;
(3)求四边形GEHF的周长的最小值.
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