如图,
是等边三角形,点D在
上,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/606049cf-11a2-4794-87f3-21ee14118517.png?resizew=129)
(1)求证:
;
(2)判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/606049cf-11a2-4794-87f3-21ee14118517.png?resizew=129)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f38d226f49fd2a69fe7e2fda40c182e.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
更新时间:2023-12-23 10:21:50
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在等边
中,
,点P从点A出发沿
边向点B以每秒2个单位的速度移动,点Q从点C出发沿
边向点A以每秒4个单位的速度移动.P,Q两点同时出发,它们移动的时间为t秒.
(1)用含t的代数式表示:
,
;
(2)在点P,Q的运动过程中,是否存在t,使得
与
全等?如果能,请求出t的值;如果不能,请说明理由;
(3)若P、Q两点分别从A、C两点同时出发,并且都按逆时针方向沿
的三边运动,请问经过几秒点P与点Q第一次相遇?并说明相遇的位置.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5685dc4334f1225bc3b62ea645a595d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/3e0d4eca-5155-491d-a583-a408b56022c3.png?resizew=169)
(1)用含t的代数式表示:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/524f25e1eedbfe399f7f42db890ab89a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebbc9c4e4db6374d5ba4c5dec8747442.png)
(2)在点P,Q的运动过程中,是否存在t,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b17f20c25bb16153b5f2d25062ed7a7.png)
(3)若P、Q两点分别从A、C两点同时出发,并且都按逆时针方向沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图,在
的正方形网格中,每一个小正方形的边长为
,小正方形的顶点为格点,已知
,
,
,
为格点.
(1)试说明
为等腰三角形.
(2)请你仅用无刻度的直尺,在线段
上求作一点
,使得
,并简单说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e89900589ac1333e2a87723c2c4469a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/21/9d9f64ec-9079-4379-869d-69c069fb01ec.png?resizew=122)
(1)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)请你仅用无刻度的直尺,在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650abc501b8d26ec0556b168e9ad20df.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】习题改编.
原题:梯形ABCD,AD∥BC,∠B=90°,∠DCB=60°,BC=4,AD=2,△PMN,PM=MN=NP=a,BC与MN在一直线上,NC=6,将梯形ABCD向左翻折180°.
![](https://img.xkw.com/dksih/QBM/2019/5/20/2207498686496768/2213226831273984/STEM/4be3da11b33e4a0aba6d0c17fe6acdac.png?resizew=359)
(1)向左翻折二次,a≥2时,求两图形重叠部分的面积;
(2)向左翻折三次,重叠部分的面积等于梯形ABCD的面积,a的值至少应为多少?
(3)向左翻折三次,重叠部分的面积恰好等于梯形ABCD的面积的一半,求a的值.
原题:梯形ABCD,AD∥BC,∠B=90°,∠DCB=60°,BC=4,AD=2,△PMN,PM=MN=NP=a,BC与MN在一直线上,NC=6,将梯形ABCD向左翻折180°.
![](https://img.xkw.com/dksih/QBM/2019/5/20/2207498686496768/2213226831273984/STEM/4be3da11b33e4a0aba6d0c17fe6acdac.png?resizew=359)
(1)向左翻折二次,a≥2时,求两图形重叠部分的面积;
(2)向左翻折三次,重叠部分的面积等于梯形ABCD的面积,a的值至少应为多少?
(3)向左翻折三次,重叠部分的面积恰好等于梯形ABCD的面积的一半,求a的值.
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解答题-证明题
|
适中
(0.65)
名校
【推荐2】如图,在四边形
中,
是对角线,
是等边三角形,将线段
绕点C顺时针旋转
得到线段
,连接
.
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a56dec16d1d3b76a2a292293d09907e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/8ce2200e-556d-4d11-b129-8e38559030bd.png?resizew=208)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf83fb18b98315f68a13f31f3260069.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed50dcd2a24f5cd1b10966c0cf92504.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
您最近一年使用:0次