如图,在
中,
,
于点 D,
,
,E,F 分别是
,
的中点.
(1)求证:四边形
是菱形;
(2)若 H 从F点出发,沿线段
以每秒 2 cm 向 E 点运动,点 P 从 B点出发,在线段
上以每秒 3 cm 的速度向 C 点运动,设运动时间为 t s.
①当
______时,四边形
是平行四边形;
②是否存在 t 的值,使四边形
是菱形?若存在,求出 t 的值,若不存在,说明理由.
![](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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3293d62e288b4971cd4f47bad3a41a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19c7ee7b08df8f200d7b55a8737bf944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/6057344c-1639-4252-b26c-48431f7cbc83.png?resizew=135)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
(2)若 H 从F点出发,沿线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/825116eb345f5505ebc8c1cdb8a1f131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f987a6eb59f0ce4c0feaf8e0c7a2300.png)
②是否存在 t 的值,使四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e79a87f50b98a060a71b1542703b94.png)
更新时间:2023-07-23 16:40:28
|
相似题推荐
解答题-证明题
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适中
(0.65)
【推荐1】如图,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/181a87e1244f3986865ed5803c8f2a91.png)
(2)若
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【推荐2】如图,在平面直角坐标系中,直线
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【推荐1】如图,在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5aac0c43f94c561bacc7c9ac666f583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650b92218a0b38a1737d54ffe4c57ad5.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图
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,
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解答题-证明题
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(0.65)
【推荐1】如图,在△ABC中,AB=AC,AE是∠BAC的角平分线,点O为AB的中点,延长EO交△ABC的外角平分线于点F.
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解答题-问答题
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(0.65)
【推荐2】如图,四边形
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适中
(0.65)
【推荐1】如图,两条宽度都是3cm的纸条交错地叠在一起,相交成∠α=60°.
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真题
名校
【推荐2】在
中,
、
分别是
、
的中点,
,延长
到点
,使得
,连接
.
(2)若CE=4,∠BCF=120°,求菱形BCFE的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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(2)若CE=4,∠BCF=120°,求菱形BCFE的面积.
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