如图,正方形
的边
在坐标轴上,点B的坐标为
.点P从点A出发,以每秒1个单位长度的速度沿x轴向点O运动;点Q从点O同时出发,以相同的速度沿x轴的正方向运动,规定点P到达点O时,点Q也停止运动.连接
,过P点作
的垂线,与过点Q平行于y轴的直线
相交于点D.
与y轴交于点E,连接
.设点P运动的时间为
.
的度数为______,点D的坐标为______(用t表示);
(2)求当
为何值时,
为等腰三角形?
(3)探索
周长是否随时间t的变化而变化?若变化,说明理由;若不变,试求这个定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b26075ea855e1504fe8d2e3aec383b1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e3fe42c58bceadb245c817270bdebe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41fb80b591b497d8d7a6d8592160de44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e98f2e85bdf9c6669c14f8966ed53be.png)
(2)求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecf4b43b6792b9ae78a1c8cae4e60524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b6accdd9b317c922d335e44911df357.png)
(3)探索
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b98bec817e96fba365ba496ad3b9af.png)
2015·广东东莞·一模 查看更多[13]
2015届广东省东莞市五校联考中考一模数学试卷2016届山东省济南市高新区九年级下学期第一次模拟测试数学试卷2017届山东省济南市天桥区九年级学业水平考试第一次模拟数学试卷山东济南市历下区五十中学 2017年九年级数学中考模拟试卷人教版数学中考专题复习 正方形的计算和证明问题课后练习【全国校级联考】江苏省东台市第一联盟2017-2018学年八年级下学期期中考试数学试题湖北省武汉市第十四中学2018-2019学年度第二学期八年级下册期中数学试题福建省南平市建瓯市房道中学2020-2021学年九年级上学期10月月考数学试题2022年江苏省扬州市朱自清中学中考二模数学试题湖北省孝感市云梦县实验外国语学校2021-2022学年八年级下学期期中数学试题福建省莆田市城厢区华林学校2023-2024学年九年级上学期月考数学试题湖南省长沙市立信中学2023-2024学年八年级下学期第一次月考数学试题(已下线)数学-2024年中考考前最后一课(10)
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解答题-证明题
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【推荐2】提出问题
如图1,在
,
,
为
边的中点,连接
.若
,
,则
;
探究问题
如图2,在四边形
,已知
,求证:
,
,
,
四点共圆;
解决问题
某社区有如图3所示的直角三角形空地
,其中
,社区工作人员想在
边上找一点
栽种一棵树,并同时在
和
边上各自找一点
和
,修筑
,
,
三条小路,并且要求
,为了美化这片空地,社区人员想用一堆碎瓷片铺设在小路
上,为了变废为宝,使这些碎瓷片得以全部利用,小路
的长至少为
,已知
,为满足以上条件,请你帮社区工作人员计算一下,点
应该在
边上,距
点多少米处?
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ec5d678ec42846e1d28301e3bfd4be.png)
探究问题
如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/853e81b1b9606ad25244ff82c8292df6.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)
解决问题
某社区有如图3所示的直角三角形空地
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83833e7a3dfca1083632d301c3260f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09905ffb3a353e3051b16bd6b72b237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a61e3c6925a197a045c426e6deadaa99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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解答题-问答题
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【推荐1】在
中,
,点
是射线
上一个动点,点
是
延长线上一点,且
,
,交直线
于点
,
平分
,交射线
于点
,
,交直线
于点
,连接
交直线
于点
.
![](https://img.xkw.com/dksih/QBM/2021/5/26/2729271712833536/2776649021784064/STEM/00e6eaa2-21e2-4e09-8154-dd8cbf3f5d93.png)
(1)①如图1,当
,点
是
中点时,
的长是______;
②如图2,当
,
,点
在边
上移动时,
的长是否为定值?若是,请求出
的值;若不是,请说明理由;
(2)当
,
,点
在边
的延长线上移动时,请直接写出
的长(用含有
,
的代数式表示).
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d9136d29086e532aedf15bbc1d7554f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e210c9698063925ad2df6b6c1749571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd1bc0388e7fad3e849ca39c67f5034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0c9dd8763d3b480410201b8abc22fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://img.xkw.com/dksih/QBM/2021/5/26/2729271712833536/2776649021784064/STEM/00e6eaa2-21e2-4e09-8154-dd8cbf3f5d93.png)
(1)①如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42756888c62e5ec6bcc3885000560e65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
②如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a88b719166fcc1431f876bc8c5656c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
您最近一年使用:0次
解答题-证明题
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较难
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解题方法
【推荐2】已知:在
中,
,
.将
按如图所示的位置放置在平面直角坐标系中,使得点
落在
轴的负半轴上,使得点
落在
轴的正半轴上,点
在第二象限,并且
满足
.
(1)由题意可知
_____,
_____(直接写答案);
(2)求点
的坐标;
(3)
的斜边
交
轴于
,直角边
交
轴于
.在
上截取
,连接
.探究线段
的数量关系并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/178a27068cf5517ad64f211af10256ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/739103e7904353fc339841f65b680c61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021a45dc5c6e1b371ee887c1cbe2e9e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280860dd039e1305a5ccc455f63e8223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/983d7d5ab46c0a37666e8229ecef95c8.png)
(1)由题意可知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a548e8a2e2205f2faa87e25180a083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a836d2dfc31d2bfc949bac8403cf2a4e.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)
![](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/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c581dab991aeadf06d972e47673ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b6d47a6fd13b5a6bc1f29e1c0628a86.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/d991d718-75d6-4d69-a449-565d04bb2434.png?resizew=193)
您最近一年使用:0次
解答题-证明题
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(0.4)
【推荐3】如图①,直线AB与x轴负半轴、y轴正半轴分别交于A、B两点.OA、OB的长度分别为m和n,且满足m2+n2=2mn.
(1)判断△AOB的形状.
(2)如图②,正比例函数y=kx(k<0)的图象与直线AB交于点Q,过A、B两点分别作AM⊥OQ于M,BN⊥OQ于N,若AM=13,MN=6,求BN的长.
(3)如图③,E为线段AB上一动点,以AE为斜边作等腰直角△ADE,P为BE的中点,连接PD、PO.试问:线段PD、PO是否存在某种确定的数量关系和位置关系?写出你的结论并证明.
(1)判断△AOB的形状.
(2)如图②,正比例函数y=kx(k<0)的图象与直线AB交于点Q,过A、B两点分别作AM⊥OQ于M,BN⊥OQ于N,若AM=13,MN=6,求BN的长.
(3)如图③,E为线段AB上一动点,以AE为斜边作等腰直角△ADE,P为BE的中点,连接PD、PO.试问:线段PD、PO是否存在某种确定的数量关系和位置关系?写出你的结论并证明.
![](https://img.xkw.com/dksih/QBM/2021/3/6/2671915449196544/2672220868984832/STEM/19955e0cefa243c281f7d72d054dcb1b.png?resizew=519)
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解答题-问答题
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名校
【推荐1】如图,在四边形ABCD中,
,
,
,
,点P从点B出发,沿线段BA,向点A以
的速度匀速运动;点Q从点D出发,沿线段DC向点C以
的速度匀速运动,已知两点同时出发,当一个点到达终点时,另一点也停止运动,设运动时间为
.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2417884795592704/2417959314046976/STEM/b4e93f64-c414-463f-9160-c0b9980235bb.png?resizew=329)
(1)连结P、Q两点,则线段PQ长的取值范围是________;
(2)当
cm时,求t的值;
(3)若在线段CD上有一点E,
cm,连结AC和PE.请问是否存在某一时刻使得AC平分PE?若存在,求出t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3bbe4cdd2c154bd9a8073b0d4cecb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bed37901d60d2b5e0746f496ce29aed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67fa79283e769e44399dab522aeaaf71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12ddc6c8e8316243479361a001fce194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f0741be7fcc82f7839d18fa815a5084.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca07a30fd25907fbb2f54e0d639b512.png)
![](https://img.xkw.com/dksih/QBM/2020/3/12/2417884795592704/2417959314046976/STEM/b4e93f64-c414-463f-9160-c0b9980235bb.png?resizew=329)
(1)连结P、Q两点,则线段PQ长的取值范围是________;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57a2d7742a001efebcb78fc5504be8e8.png)
(3)若在线段CD上有一点E,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d219551540c1ff0b91f2eb9bd5cb91.png)
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解答题-证明题
|
较难
(0.4)
【推荐2】(1)【探究】如图1,正方形
中,点
、
分别是
,
上一点,
.
①求证:
;
②若
,
,求正方形的边长
.
(2)【应用】如图2,正方形
中,点
在
边上(不与端点重合),
、
分别是
,
上一点,
交
于点
,
,若
,直接写出
的值:.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b24dfa37067ff455888ebe076eeb1fb2.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60572975f9ac06ffc8d98ef94de49eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)【应用】如图2,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3960ef73e181702172e9f87cab54d9c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48413207afeb6e298f614b737e958e24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1296d76b5d492316f53a1cd0cb0c2029.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐1】如图1,正方形
的边长为
,点
从点
出发,沿射线
方向以
/秒的速度移动,点
从点
出发,向点
以
/秒的速度移动(不到点
).设点
,
同时出发移动
秒.
(1)在点
,
移动过程中,连接
,
,
,则
的形状是 ,始终保持不变;
(2)如图2,连接
,设
交
移动
,当
时,求
的长;
(3)如图3,点
,
分别在边
,
上,且
,连接
,当
与
的夹角为
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dd6f4250ca6b1b9bce234a01f00d44d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/21/d4c866cf-cb21-4f19-9312-a842f1acd105.png?resizew=460)
(1)在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(3)如图3,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5becff9880ee8c8ec031602955f136e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐2】如图①,已知点
为正方形
的对角线的交点,点
是对角线
上的一个动点(点
不与
重合),分别过点
向直线
作垂线,垂足分别为点
,连接
和
.
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394062952669184/2394379293286400/STEM/8f8c6942-d36f-44c7-b30b-3825fa4f8b97.png?resizew=470)
(1)求证:
;
(2)如图②,延长正方形对角线
,当点
运动到
的延长线上时,通过证明判断(1)中的结论是否仍然成立;
(3)若点
在射线
上运动,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cf9b288c48c73463a2f214f02b6952a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://img.xkw.com/dksih/QBM/2020/2/7/2394062952669184/2394379293286400/STEM/8f8c6942-d36f-44c7-b30b-3825fa4f8b97.png?resizew=470)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcf2e3236ea30ee2c37928b98041f13a.png)
(2)如图②,延长正方形对角线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cca04284fc132a964cb033ee9272417.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
您最近一年使用:0次