如图,在四边形ABCD中,
,
,
,
,
,动点E从点A出发,在线段AD上以每秒
的速度向点D运动,动点F从点C出发,在线段CB上以每秒
的速度运动到B点返回,点E、F分别从点A、C同时出发,当点E运动到点D时,点F随之停止运动,设运动的时间为t(秒)
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962267746713600/3061486143201280/STEM/462553a3e26644bf92b72576a53a049e.png?resizew=402)
(1)用含t的代数式表示DE,
______;
(2)若四边形EFCD是平行四边形,求此时t的值;
(3)是否存在点P,使
是等腰三角形?若存在,请直接写出所有满足要求的t的值;若不存在,请说明由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dceb5cc71fc50f20649f6b9535fd914.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b79850d6b00a67110e77a33d1c46b5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ca22cb9f8c16663d177f794f1274c7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d4bc1be051f904d4a6e06dc825395b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c78d0ab561d0c9bb9099772c596af8bf.png)
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962267746713600/3061486143201280/STEM/462553a3e26644bf92b72576a53a049e.png?resizew=402)
(1)用含t的代数式表示DE,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/404728d0ea2699c71e674f30dd984abd.png)
(2)若四边形EFCD是平行四边形,求此时t的值;
(3)是否存在点P,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e9b8a991d00fdd2810dda7adc54fd8.png)
更新时间:2022-09-07 19:52:24
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相似题推荐
解答题-证明题
|
较难
(0.4)
名校
【推荐1】【探究发现】
(1)如图1,在
中,
.
,垂足为
,点
在
上,连接
,
.则有下列命题:①
;②
,请你从中选择一个命题证明其真假,并写出证明过程.
【类比迁移】
(2)如图2,在
中,
,
,点
在三角形的内部,过点
作
,且
,连接
.求证:
.
【拓展提升】
(3)如图3.在
中,
,
,把线段
绕点
顺时针方向旋转
到
,把线段
绕点
逆时针旋转
到
,分别连接
,
,
,请直接写出
面积的最大值.
(1)如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4744b427f036dfbc6db68c87cd5c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a973a18f9d621ca7e060102d48565f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20134ace504d174f94f0b87283c2d204.png)
【类比迁移】
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9c7cbcc38b28d45c8539710e5b260a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd72e399cbc9beead45a955482dd315.png)
【拓展提升】
(3)如图3.在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98013a5042685a1db94249e70c62c09a.png)
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解答题-证明题
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【推荐2】如图,
中,
.点D在
的延长线上.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/32319c2d-03d6-4df2-8a56-b9a9a37a96ab.png?resizew=318)
(1)如图1,若
,求出
的度数;
(2)如图2,以
为腰在上方作等腰直角三角形,
.点F是
的中点,过点F作
于G.求证:
;
(3)当
时,仍按(2)的方式作等腰直角三角形
和
,把
沿
翻折到平面内,点F的对应点为
.若
,请直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7f97bf47387beb9f9fd0253b8a21234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/32319c2d-03d6-4df2-8a56-b9a9a37a96ab.png?resizew=318)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df4a2a127d89d50d3fde881a9b58ef0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
(2)如图2,以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d667f4052b66aaa9c7bae85395f9fa17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ea178b94b0039c40f686c77ebc9a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9ec8619b2652e4efe94de9a08a6865d.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcfac9ab1dc776c9ec076ab2a132fcd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/422210c777ac0d625bbd81cc7601bf9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40277f2c88dc0b716383fc785df8ab7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e55590555905eb4f57889bbd16e39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ee3e567700c1d5b17944ffc6229c78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3184cd468586362043f15d3964991725.png)
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【推荐1】如图,矩形ABCD中,
,点E、F、G、H,分别是BC、CD、AD、AB上的动点(顶点除外),若
;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/4da31324-fb93-4ece-8e07-af1095ff43e6.png?resizew=457)
(1)在图1中,点E,F,G,H分别是BC,CD,AD,AB上的中点.
①判断四边形EFGH的形状,并证明;
②若四边形EFGH是正方形,求BC的长;
(2)在图2中,已知
,判断四边形EFGH的周长是否会随着点G的变化而变化,如不变化,求出其周长,若会变化,说明理由;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090364f302a73c18af24f602c34dc3e4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/4da31324-fb93-4ece-8e07-af1095ff43e6.png?resizew=457)
(1)在图1中,点E,F,G,H分别是BC,CD,AD,AB上的中点.
①判断四边形EFGH的形状,并证明;
②若四边形EFGH是正方形,求BC的长;
(2)在图2中,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
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解答题-问答题
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【推荐1】如图,在平面直角坐标系xOy中,直线
交y轴于点A,交x轴于点B,以线段AB为边作菱形ABCD(点C、D在第一象限),且点D的纵坐标为9.
(1)求点A、点B的坐标;
(2)求直线DC的解析式;
(3)除点C外,在平面直角坐标系xOy中是否还存在点P,使点A、B、D、P组成的四边形是平行四边形?若存在,请直接写出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c437a0891d4dce2320eaa1ed25da3c3.png)
(1)求点A、点B的坐标;
(2)求直线DC的解析式;
(3)除点C外,在平面直角坐标系xOy中是否还存在点P,使点A、B、D、P组成的四边形是平行四边形?若存在,请直接写出点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2017/5/20/1690945357201408/1693107517767680/STEM/b174fe9e1cbb4a828cdf7672d3442154.png?resizew=201)
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解答题-作图题
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【推荐2】例在
中,点E为AB上一点,请仅用无刻度直尺按要求作图(保留作图痕迹,不写作法,题目要求画的线画实线,其他的线画虚线)
边上一点,
,画出∠D的角平分线;
(2)如图2,E为
边上一点,
,画出∠B的角平分线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
(2)如图2,E为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
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解答题-证明题
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【推荐1】已知,如图①,四边形
是矩形,对角线
相交于点O,
.
在图①中,根据给出的条件,直接写出一条未知线段的长度或一个角的大小;
(2)【问题探究】
如图②,在矩形
中,点P是对角线
上的一个动点,连接
,过点P作
交
于点E,连接
,在点P运动的过程中试探究
的大小,并写出证明过程;
(3)【拓展延伸】
如图③,在矩形
中,点P是对角线
上的一个动点,连接
,在
的左下方作
,使
,
,在点P从点B向点D的运动过程中,猜想点Q的运动路径并求出它的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73b3c032441543354c154ee67d744abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cd4699c727a6335540e511d0ac9edb7.png)
在图①中,根据给出的条件,直接写出一条未知线段的长度或一个角的大小;
(2)【问题探究】
如图②,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a92bf37efe386e969621baf38d1eb1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9b4a78c3b85dafdaec2e4e6dc87bd7.png)
(3)【拓展延伸】
如图③,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec07fc1e0cf74270d42f53458713af3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/114a5ad325caa9a344eb5dd198413859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5fcdc6174333e0d2e6547e59219b07a.png)
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【推荐2】在平行四边形ABCD中,∠ADC的平分线交BC于点E,交AB的延长线于点F,连接AC.
![](https://img.xkw.com/dksih/QBM/2022/3/24/2943069567705088/2943830929571840/STEM/9204e63a-34b9-4da9-b4e1-faf72ab233c5.png?resizew=461)
(1)如图1,若∠ADC=90°,G是EF的中点,连接AG、CG.
①求证:BE=BF;
②请判断△AGC的形状,并说明理由.
(2)如图2,若∠ADC=60°,将线段FB绕点F顺时针旋转60°至FG,连接AG、CG,请判断△AGC的形状,并说明理由.
(3)如图3,∠ADC=90°,作∠BED的角平分线EH交AB于点H,已知AB=9,BH=2AH,求BC的长.
![](https://img.xkw.com/dksih/QBM/2022/3/24/2943069567705088/2943830929571840/STEM/9204e63a-34b9-4da9-b4e1-faf72ab233c5.png?resizew=461)
(1)如图1,若∠ADC=90°,G是EF的中点,连接AG、CG.
①求证:BE=BF;
②请判断△AGC的形状,并说明理由.
(2)如图2,若∠ADC=60°,将线段FB绕点F顺时针旋转60°至FG,连接AG、CG,请判断△AGC的形状,并说明理由.
(3)如图3,∠ADC=90°,作∠BED的角平分线EH交AB于点H,已知AB=9,BH=2AH,求BC的长.
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