1 . 在平行四边形ABCD中,过点D作DE⊥AB于点E,点F在边CD上,DF=BE,连接AF,BF.
(1)求证:四边形BFDE是矩形;
(2)若CF=9,BF=12,DF=15,求证:AF平分∠DAB.
(1)求证:四边形BFDE是矩形;
(2)若CF=9,BF=12,DF=15,求证:AF平分∠DAB.
![](https://img.xkw.com/dksih/QBM/2021/1/13/2635342399840256/2639396583661568/STEM/ccae5d45b58249bb99b6eb992acba4d9.png?resizew=191)
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2 . 如图,
中,
,
,点D,E,分别在CA,BC的延长线上,且
.过点C作
,垂足为F,FC的延长线交AB的延长线于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/d20cc86e-762c-48c5-8ec1-230c2d7347b2.png?resizew=241)
(1)求证:
;
(2)①在图中找出与CG相等的线段,并证明;
②探究线段AG、BG、DE之间的数量关系(直接写出);
(3)若
.求
的值(用含k的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7cc087c22e1fc1197236c71e5465d33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/4/d20cc86e-762c-48c5-8ec1-230c2d7347b2.png?resizew=241)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e71cbf0513ddc87a4ba391e295d229b.png)
(2)①在图中找出与CG相等的线段,并证明;
②探究线段AG、BG、DE之间的数量关系(直接写出);
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/788cfc04a1b49ab3099a18e29678e104.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad75d52164547b022d8c895205a6c84.png)
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3 . 如图,点A,B都在x轴上,过点A作x轴的垂线交抛物线
于点C,过点B作x轴的垂线交该抛物线于点D,点C,D都在第一象限,点D在点C的右侧,
于点E,连结
,
,
.
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629504993550336/2633981341499392/STEM/f1becc9c-0d95-46f5-9a52-e8ab72e1a73a.png)
(1)若
,求
的长.
(2)若点A是线段
的中点,求点E的坐标.
(3)根据(2)的条件,连结
,动点P在线段
上,作
交
于点Q,当
与
相似时,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/572f286fb45b2757af63569ae0bc2e99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de728cae820b49ee7164cdbe600bdc92.png)
![](https://img.xkw.com/dksih/QBM/2021/1/5/2629504993550336/2633981341499392/STEM/f1becc9c-0d95-46f5-9a52-e8ab72e1a73a.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)若点A是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
(3)根据(2)的条件,连结
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f10966af97a837c746750ef3f75fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a138fefcb02cc063b48967c0fc9d28f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5c5a63e1e1b9044d3b37d0599915a18.png)
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20-21九年级上·陕西西安·期末
名校
4 . 问题提出:如图,在锐角
中,如何作一个正方形
,使
落在
边上,
分别落在
边上?
勤奋小组同学给出了如下作法:①画一个有三个顶点落在
两边上的正方形
;
②连接
,并延长交
于点
;③过点
作
于点
;④过
作
,交
于点
;⑤过点
作
于点
,则四边形
即为所求作的正方形.
受勤奋小组同学的启发,创新小组同学认为可以在锐角
中,作出长与宽的比为
的矩形
,使
位于边
上,
分别位于边
上.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/a6390f19-b37b-49a3-af81-860163da206c.png?resizew=497)
(1)你认为勤奋小组同学的作法正确吗?请说明理由.
(2)请你帮助创新小组同学在锐角
中,作出所有满足长与宽的比为
的矩形
,使
位于边
上,
分别位于边
上.(在备用图中完成,不写作法,保留作图痕迹)
解决问题:
(3)在(2)的条件下,已知
的面积为36,
,求出矩形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5881068127a39caf319492b4177204f0.png)
勤奋小组同学给出了如下作法:①画一个有三个顶点落在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a42b2cc13fc294a6b7ff1cc8d1b1b7.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2588559c01596b7d95c3431ce2d14d1.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.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/fdd2e599ebb7a0a1c13a0b4b228f5156.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa6399528438e294eb126b6a4862ece.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
受勤奋小组同学的启发,创新小组同学认为可以在锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe103f073845122c66f22dcb14b711f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5881068127a39caf319492b4177204f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/a6390f19-b37b-49a3-af81-860163da206c.png?resizew=497)
(1)你认为勤奋小组同学的作法正确吗?请说明理由.
(2)请你帮助创新小组同学在锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbe103f073845122c66f22dcb14b711f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0cf33d73483c93f24cc6a1d76ef22ca6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5881068127a39caf319492b4177204f0.png)
解决问题:
(3)在(2)的条件下,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
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2021-01-10更新
|
237次组卷
|
4卷引用:陕西省西安市莲湖区益新中学2020-2021学年九年级上学期期末数学试题
陕西省西安市莲湖区益新中学2020-2021学年九年级上学期期末数学试题(已下线)陕西省西安市莲湖区2020-2021学年度第一学期末初三学业质量监测 (数学)山西省晋城市2020-2021学年九年级上学期期末数学试题山西省长治市实验中学2020-2021学年九年级上学期期末数学试题
5 . 汝阳某公司举办热气球表演来庆祝开业,如图,小敏、小亮从A,B两地观测空中C处一个气球,分别测得仰角为
和
,A、B两地相距100 m.当气球沿与BA平行地飘移100秒后到达D处时,在A处测得气球的仰角为
.
![](https://img.xkw.com/dksih/QBM/2020/12/18/2623781958598656/2630456058773504/STEM/01cdca9d-0b2f-4a61-a6bd-43182570527a.png?resizew=239)
(1)求气球的高度;
(2)求气球飘移的平均速度.(参考数据:
,
,
,
.)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8141d00b74eb4c50bf861e6ff0edf137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://img.xkw.com/dksih/QBM/2020/12/18/2623781958598656/2630456058773504/STEM/01cdca9d-0b2f-4a61-a6bd-43182570527a.png?resizew=239)
(1)求气球的高度;
(2)求气球飘移的平均速度.(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8485466d2127bd681a322f87c58f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67802092c4c9f3b1cff1f9502b7d1ded.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8a7ff6bb8000946da9599d7d903ac9a.png)
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6 . 如图,在矩形ABCD中,
,
,动点P从点A出发,以2cm/s的速度沿AB向点B移动,同时,点Q从点C出发,以lcm/s的速度沿CD向点D移动(点P到达点B停止时,点Q也随之停止运动),设点P运动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/19/f8997434-954b-4db8-a3a9-39b78d85b83c.png?resizew=262)
(1)试求当t为何值时四边形APQD为矩形;
(2)P、Q两点出发多长时间,线段PQ的长度为5cm.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9547f6b5c7c54d216ecea72becb7d373.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/19/f8997434-954b-4db8-a3a9-39b78d85b83c.png?resizew=262)
(1)试求当t为何值时四边形APQD为矩形;
(2)P、Q两点出发多长时间,线段PQ的长度为5cm.
您最近一年使用:0次
2020-12-31更新
|
221次组卷
|
5卷引用:江苏省盐城市射阳县2019-2020学年九年级上学期期末联考数学试题
江苏省盐城市射阳县2019-2020学年九年级上学期期末联考数学试题(已下线)专题1.13 特殊平行四边形动点问题(专项练习)-2022-2023学年九年级数学上册基础知识专项讲练(北师大版)河北省承德市第七中学2021-2022学年九年级上学期第一次月考数学试卷广东省茂名市高州市第一中学附属实验中学2022-2023学年九年级下学期开学数学试题广东省广州市大亚湾经济技术开发区第三中学2023-2024学年九年级上学期月考数学试题
名校
7 . 如图所示,小亮在大楼
的观光电梯中的
点测得大楼
楼底
点的俯角为60°,此时他距地面的高度
为21米,电梯再上升9米到达
点,此时测得大楼
楼顶
点的仰角为45°,求大楼
的高度.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/12/16/2620302882103296/2625362970198016/STEM/badfad1f-7921-46aa-832e-210363cd2662.png)
您最近一年使用:0次
2020-12-30更新
|
742次组卷
|
9卷引用:辽宁省沈阳市沈河区2020-2021学年九年级上学期期末数学试题
辽宁省沈阳市沈河区2020-2021学年九年级上学期期末数学试题山东省东营市河口区(五四制)2020-2021学年九年级上学期期末数学试题安徽省阜阳市2020-2021学年九年级上学期期末数学试题2021年天津市河西区中考数学模拟试题2021年安徽省宣城市三校联考中考数学模拟试卷(3月份)山东省济南市莱芜区实验中学片区教研共同体(五四制)2020-2022学年九年级上学期期中考试数学试题山东省济南市钢城区里辛初级中学(五四制)2021-2022学年九年级上学期期中考试数学试题山东省东营市河口区实验学校2022-2023学年九年级上学期期中数学试题湖南省湘潭市湘潭县湘潭江声实验学校2023-2024学年九年级上学期月考数学试题
8 . 如图,面积为16的菱形ABCD中,点O为对角线的交点,点E是边BC的中点,过点E作
于点F,
于点G,则四边形EFOG的面积为__ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c672f693a7e75a7bae4936dcb1920430.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827beb23a9fe02a8b588645bcb82ce67.png)
![](https://img.xkw.com/dksih/QBM/2020/12/25/2621717454282752/2623998510923776/STEM/c1b729124abc45d9911a62de0f9f5321.png?resizew=202)
您最近一年使用:0次
2020-12-28更新
|
371次组卷
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5卷引用:辽宁省沈阳市铁西区、浑南区2020-2021学年九年级上学期期末数学试题
辽宁省沈阳市铁西区、浑南区2020-2021学年九年级上学期期末数学试题辽宁省沈阳市铁西区大青实验学校2022-2023学年九年级上学期期末数学试题(已下线)考点17 矩形、菱形、正方形(考点专练)-备战2021年中考数学考点微专题(已下线)专题18.8 菱形(专项练习)-2020-2021学年八年级数学下册基础知识专项讲练(人教版)(已下线)专题6.6 三角形的中位线(专项练习)-2020-2021学年八年级数学下册基础知识专项讲练(北师大版)
解题方法
9 . 定义:有且仅有一组对角相等的凸四边形叫做“准平行四边形”.例如:凸四边形
中,若
,
,则称四边形
为准平行四边形.
(1)如(图①),
、
、
、
是⊙O上的四个点,
,延长
到
,使
.求证:四边形
是准平行四边形;
(2)如(图②),准平行四边形
内接于⊙O,
,
,若⊙O的半径为5,
,求
的长;
(3)如(图③),在
中,
,
,
,若四边形
是准平行四边形,且
,请直接写出
长的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1393308bc68322f50fa29702dd412263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520d831f0b99a1698f06775cc2047390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/19/d5772f9f-aed7-44d3-80fd-1dc49570c3cc.png?resizew=381)
(1)如(图①),
![](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://staticzujuan.xkw.com/quesimg/Upload/formula/991fdca41f19de62f60e293c3756aee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/045b85674bbe01e477c76501affed905.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ba22b69231ffb2878458c15c51bd90.png)
(2)如(图②),准平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c06e36ec59fa93ac857e35796a4b8311.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4009aa13093cc3865dcd51b371892160.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)如(图③),在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5755afc235f06b6a6c8624aaa0a6aa5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
2020-12-24更新
|
535次组卷
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7卷引用:江苏省扬州市仪征市2019-2020学年九年级上学期期末数学试题
江苏省扬州市仪征市2019-2020学年九年级上学期期末数学试题江苏省南通市如东县2019-2020学年九年级上学期期中数学试题(已下线)专题18创新型与新定义综合问题-决胜2020年中考数学压轴题全揭秘精品(2)湖南省长沙市周南教育集团2020-2021学年九年级上学期12月联考数学试题湖南长沙周南集团2019-2020学年九年级下学期第三次联考数学试题(已下线)必刷卷02-2021年中考数学考前信息必刷卷(湖南长沙专用)江苏省扬州市江都区八校联谊2022-2023学年九年级数学上学期期中试题
10 . 如图,C为线段BD上一动点,分别过点B,D作AB⊥BD,DE⊥BD,连结AC,CE.
(1)已知AB=3,DE=2,BD=12,设CD=x.用含x的代数式表示AC+CE的长;
(2)请问点C满足什么条件时,AC+CE的值最小?并求出它的最小值;
(3)根据(2)中的规律和结论,请构图求出代数式
的最小值.
(1)已知AB=3,DE=2,BD=12,设CD=x.用含x的代数式表示AC+CE的长;
(2)请问点C满足什么条件时,AC+CE的值最小?并求出它的最小值;
(3)根据(2)中的规律和结论,请构图求出代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4073c77424958c46fa4216e28db185a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/c69f7d08-02e0-4a28-9e4f-f3ae6d482c68.png?resizew=154)
您最近一年使用:0次
2020-12-21更新
|
325次组卷
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3卷引用:【新东方】 初中数学1230初二上