题型:解答题
难度:0.4
引用次数:1756
题号:6511952
如图,四边形ABCD中,AD∥BC,∠A=90°,BD=BC,点E为CD的中点,射线BE交AD的延长线于点F,连接CF.
(1)求证:四边形BCFD是菱形;
(2)若AD=1,BC=2,求BF的长.
(1)求证:四边形BCFD是菱形;
(2)若AD=1,BC=2,求BF的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/16/6ef1c598-9946-4268-b2b6-23d23768714c.png?resizew=168)
更新时间:2018-06-12 22:16:39
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【知识点】 根据菱形的性质与判定求线段长
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较难
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解题方法
【推荐1】如图1,菱形
中,
,垂足为
,
,
,把四边形
沿
所在直线折叠,使点
落在
上的点
处,点
落在点
处,
交
于点
.
![](https://img.xkw.com/dksih/QBM/2019/5/18/2206393100763136/2207180767592448/STEM/891b73a267ba42a38a9588c80072c6c1.png?resizew=161)
(1)证明:
;
(2)求四边形
面积;
(3)如图2,点
从点
出发,沿
路径以每秒
的速度匀速运动,设运动时间为
秒,当
为何值时,
的面积与四边形
的面积相等.
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![](https://img.xkw.com/dksih/QBM/2019/5/18/2206393100763136/2207180767592448/STEM/891b73a267ba42a38a9588c80072c6c1.png?resizew=161)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f47052f46c225e1059ab619db46549.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0024de04cde3ffe2a7fba244cc09507.png)
(3)如图2,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b73be6292478fcab91f8e2397d72c559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0024de04cde3ffe2a7fba244cc09507.png)
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解答题-问答题
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较难
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解题方法
【推荐2】如图,矩形OABC的顶点A、C分别在x轴、y轴的正半轴上,点B的坐标为(3,4),一次函数y=
的图象与边OC,AB分别交于点D,E,并且满足OD=BE,点M是线段DE上的一个动点.
(1)求b的值;
(2)当DM:ME=1:2时,求点M的坐标;
(3)设点N是x轴上方的平面内的一点,当以点O,M,D,N为顶点的四边形是菱形时,直接写出点N的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57b26ac6a029c4d5a54ae88a5f0e4ab0.png)
(1)求b的值;
(2)当DM:ME=1:2时,求点M的坐标;
(3)设点N是x轴上方的平面内的一点,当以点O,M,D,N为顶点的四边形是菱形时,直接写出点N的坐标.
![](https://img.xkw.com/dksih/QBM/2021/8/6/2780114512953344/2781559911989248/STEM/91a5255e-8207-4ccc-a610-26dcad9e823f.png)
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【推荐3】如图,已知菱形ABCD中,对角线AC、BD相交于点O,且AC=12cm,BD=16cm,点P从点D出发,沿DA方向匀速向点A运动,速度为2cm/s;同时,点E从点B出发,沿BO方向匀速向点O运动,速度为1cm/s,EF∥BC,交OC于点F.当点P、E中有一点停止运动时,另一点也停止运动,线段EF也停止运动,连接PE、DF(0<t<5).解答下列问题:
(1)当t为何值时,PE∥AB?
(2)设四边形EFDP的面积为y(
),求y与t之间的函数关系式.
(3)是否存在某一时刻t,使得
?若存在,求出t的值;若不存在,请说明理由.
(4)连接FP,是否存在某一时刻t,使得FP⊥AD?若存在,求出t的值;若不存在,请说明理由.
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(2)设四边形EFDP的面积为y(
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(4)连接FP,是否存在某一时刻t,使得FP⊥AD?若存在,求出t的值;若不存在,请说明理由.
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