如图,
中,
,
,
,D是
的中点,动点P从点A出发,沿线段
以每秒2个单位长度的速度向终点C运动,设点P的运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/64fa5f80-209e-46e9-bf92-b254a9220ce3.png?resizew=144)
(1)当t为多少秒时,以点A、D、P为顶点的三角形与
相似?
(2)若
为钝角三角形,请直接写出t的取值的范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d2eae98e1683fbb9533584450dd696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.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/2022/11/8/64fa5f80-209e-46e9-bf92-b254a9220ce3.png?resizew=144)
(1)当t为多少秒时,以点A、D、P为顶点的三角形与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34225c19f237191199ea06b1ae426400.png)
更新时间:2022-11-08 08:28:42
|
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解答题-问答题
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适中
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【推荐1】一个三角形,三个内角度数的比是
.已知其中的两条边分别长1分米和1.4分米,按角分,这个三角形是什么三角形?它的面积是多少平方分米?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e1dddea7e79dd6e1ff2cae04608cdc.png)
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【推荐2】如图,在
中,
,点D从点B出发沿
向点C运动,点E从点C出发沿
向点B运动,点D和点E同时出发,速度相同,到达C点或B点后运动停止.
(1)求证:
;
(2)若
,求
的度数;
(3)若
的外心在其内部时,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a46ef5fc6cdb5367efae4b8b829f5c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/17/a45088a1-3033-47bc-8f72-b2039d4a23a3.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52273305805769a438772342b53c289e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d2d3643a9579f2c693ef86909441e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b47abcacc10f90489c0d52a9e269ab.png)
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解答题-问答题
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名校
【推荐1】如图,在矩形ABCD中,AB=4,BC=3,将矩形绕点C按顺时针方向旋转,使点B落在线段AC上,得矩形CEFG,边CD与EF交于点H,连接DG.
(1)CH= .
(2)求DG的长.
(1)CH= .
(2)求DG的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/15/cde9bc92-f210-476e-9f1c-c8da3cc54a5b.png?resizew=119)
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【推荐2】如图,四边形
为平行四边形,延长
到点
,使
,连结
交
于点
.
![](https://img.xkw.com/dksih/QBM/2020/4/25/2449267374268416/2449761045061632/STEM/1ffd5072f3dc47ae8cf6b7aad8fbe909.png?resizew=114)
(1)求证:
平分
;
(2)连结
,若
,
,
,求平行四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024dc2ccbbe321774df5d44e8785b203.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2020/4/25/2449267374268416/2449761045061632/STEM/1ffd5072f3dc47ae8cf6b7aad8fbe909.png?resizew=114)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
(2)连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f4ea9ffbbabd6b5c90e4678c15bb1e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】已知菱形ABCD,∠ABC=α,P为射线AB上的一点,以BP为边作菱形BPEF,使点F在线段CB的延长线上,连接EA,EC.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/201d61bb-8c5e-4e58-8b56-a9318501c52a.png?resizew=759)
(1)如图(1),若点P在线段AB的延长线上,求证:EA=EC;
(2)若点P在线段AB上,且α=120°.
①如图(2),连接AC,BD相交于点O,当P为AB的中点时,判断四边形AEBO的形状,并说明理由;
②如图(3),设AB=2a,BP=2b,当EP平分∠AEC时,求
的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/201d61bb-8c5e-4e58-8b56-a9318501c52a.png?resizew=759)
(1)如图(1),若点P在线段AB的延长线上,求证:EA=EC;
(2)若点P在线段AB上,且α=120°.
①如图(2),连接AC,BD相交于点O,当P为AB的中点时,判断四边形AEBO的形状,并说明理由;
②如图(3),设AB=2a,BP=2b,当EP平分∠AEC时,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
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【推荐2】如图,在正方形ABCD中,点E、F分别在BC、CD上,CF=
CD.请从下列两个信息:①BE=CE,②AE⊥EF中选择一个作为条件,另一个作为结论,组成一个正确命题,并给予证明.
你选择的条件是 ,结论是 (填写序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
你选择的条件是 ,结论是 (填写序号).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/deba27f3-1a79-4e09-974b-c3a9ba38a739.png?resizew=136)
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