如图,在平行四边形
中,点E是
边上的动点,现将
沿
折叠,点
是点B的对应点.
恰好落在
边上时,求证:四边形
是平行四边形;
(2)如图2,若
点
落在
上时,求
的长;
(3)如图3.若
取
的中点F,连接
,求
的取值范围
![](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/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2ea12a2e06244c3bac26861779284e3.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fcd95eaa202ca2d03cf8579d3f6ba0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab41cce6eb2d3058a644314865d16548.png)
(3)如图3.若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91bd3c841b6e15c90d8173db1d70698a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab41cce6eb2d3058a644314865d16548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
22-23八年级下·四川成都·期中 查看更多[4]
四川省成都市锦江区成都金苹果锦城第一中学2022-2023学年八年级下学期期中数学试题福建省厦门市思明区莲花中学2023-2024学年八年级下学期期中数学试题(已下线)第六章第5讲 解题技巧专题:平行四边形中折叠、旋转、线段最值问题(4类热点题型讲练)-【帮课堂】2023-2024学年八年级数学下册同步学与练(北师大版)(已下线)考题猜想3-3平行四边形(重难点,特殊四边形的性质在动点问题中的巧用)-2023-2024学年八年级数学下学期期末考点大串讲(人教版)
更新时间:2024-04-01 21:05:22
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解答题-证明题
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(0.4)
【推荐1】在等边
中,
于点
,点
为
上任意一点,连接
,点
为
的中点,点
为
上一点,且
,连接
、
、
.
(1)若
,
,求
的长;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.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/3767efa8adfb71001ad39df9560cbf6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e5f736b1195fef1d2d300168a795f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/16/197b3573-1bbb-4cc0-a010-fa0be85f63e7.png?resizew=198)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/495be6a6b940e8affe38f2bcdee246b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdc8ff8c3364857e5688b83fa1731802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2319a01218514917e446dfc807a625ff.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cb396cb680d2c1e238e49b071082bd6.png)
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【推荐2】如图①是我国汉代数学家赵爽在注解《周髀算经》时给出的赵爽弦图,是用四个全等的直角三角形与中间的小正方形
拼成的一个大正方形
.已知正方形
,点
是直线
上一动点,连接
,分别过点
,
,
向直线
作垂线,垂足分别为
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/211775c7-b9d4-43fb-86e3-e495acce9d8f.jpg?resizew=176)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/76ed8c1d-4299-4188-8b86-3597d2a8c35f.png?resizew=194)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/33aeedf1-77ec-44ee-b8dd-52b366003d57.png?resizew=163)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/f53ec2a0-d165-42c9-96c9-32d7c791f697.png?resizew=161)
(1)如图①,若直角三角形斜边
的长为5,直角边
的长为4,则
的长为______.
(2)如图②,若点
在边
上,则线段
和线段
的数量关系为______.
(3)如图③,若点
在
的延长线上,(2)中结论是否成立?请说明理由.
(4)当直线
与正方形
一边的夹角为
时,若
,请直接写出正方形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/2cdba1337ec85fa9722cb4b320a82ae6.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/211775c7-b9d4-43fb-86e3-e495acce9d8f.jpg?resizew=176)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/76ed8c1d-4299-4188-8b86-3597d2a8c35f.png?resizew=194)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/33aeedf1-77ec-44ee-b8dd-52b366003d57.png?resizew=163)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/f53ec2a0-d165-42c9-96c9-32d7c791f697.png?resizew=161)
(1)如图①,若直角三角形斜边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)如图②,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/c63e36329f5e0979f5ee776ac5d06327.png)
(3)如图③,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(4)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b4f1e7f062b8cb005e8dbaf8462db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐3】如图,在矩形ABCD中,AC=60 cm,∠BAC=60°,点E从点A出发沿AB方向以2 cm/秒的速度向点B匀速运动,同时点F从点C出发沿CA方向以4 cm/秒的速度向点A匀速运动,当其中一个点到达终点时,另一个点也随之停止运动.设点E,F运动的时间是t秒(0<t≤15).过点F作OF⊥BC于点O,连接OE,EF.
(1)求证:AE=OF;
(2)四边形AEOF能够成为菱形吗?如果能,求出相应的t值,如果不能,请说明理由;
(3)当t为何值时,△OEF为直角三角形?请说明理由.
(1)求证:AE=OF;
(2)四边形AEOF能够成为菱形吗?如果能,求出相应的t值,如果不能,请说明理由;
(3)当t为何值时,△OEF为直角三角形?请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/22/4a718b65-4db4-4b0b-839e-6bceedef410b.png?resizew=252)
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【推荐1】[问题情境]
如图1,小华将矩形纸片ABCD先沿对角线BD折叠,展开后再折叠,使点B落在射线
上,点
的对应点记为
,折痕与边
分别交于点
.
【特例感知】
(1)如图2,连接
,当点
与点
重合时,判断四边形
的形状,并说明理由;
【问题解决】
(2)如图3,当点
在线段
上时,连接
,设
与
分别交于点
,当
时,求证:
;
【深入探究】
(3)将(2)中的点
改为“在射线
上时”,(2)中其它条件不变的情形下,若
,
时,请直接 写出
的长.
如图1,小华将矩形纸片ABCD先沿对角线BD折叠,展开后再折叠,使点B落在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
【特例感知】
(1)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
【问题解决】
(2)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1fa63411b334ce13037ac0e81166e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db36b4497b911bc047253b832ae01c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde654b8bf0fb3f49acb19a8f4a1e48f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499c04aaca58c36c36430c2028103552.png)
【深入探究】
(3)将(2)中的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbc2025077fbc6922067afc766e1b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3772b40d508c907805997426c0623fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/7aaf0dfc-2d53-40c8-8c86-bc4f2b753f6a.png?resizew=548)
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【推荐2】已知△ABC中,AB=AC.
(1)如图1,在△ADE中,AD=AE,点D在线段BC上,∠DAE=∠BAC=90°,连接CE,请写出:①BD和CE之间的位置和数量关系为 、 ;
②BD、CD和AE之间的数量关系为 .
(2)如图2,在△ADE中,AD=AE,连接BE、CE,若∠DAE=∠BAC=60°,CE⊥AD于点F,AE=4,AC=
,求线段BE的长;
(3)如图3,点D是等边△ABC外一点,∠ADC=75°,若CD=3,AD=
,则BD的长为 ,请简要写出解答过程.
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844863982624768/2846312310013952/STEM/ce5e2e1e-e98c-45c8-b2e3-1f4b20499282.png?resizew=238)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844863982624768/2846312310013952/STEM/1d66f196-1abb-4530-825d-36bf28171df0.png?resizew=254)
(1)如图1,在△ADE中,AD=AE,点D在线段BC上,∠DAE=∠BAC=90°,连接CE,请写出:①BD和CE之间的位置和数量关系为 、 ;
②BD、CD和AE之间的数量关系为 .
(2)如图2,在△ADE中,AD=AE,连接BE、CE,若∠DAE=∠BAC=60°,CE⊥AD于点F,AE=4,AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/619096595112f0340a43b756e114dd3d.png)
(3)如图3,点D是等边△ABC外一点,∠ADC=75°,若CD=3,AD=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844863982624768/2846312310013952/STEM/ce5e2e1e-e98c-45c8-b2e3-1f4b20499282.png?resizew=238)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844863982624768/2846312310013952/STEM/1d66f196-1abb-4530-825d-36bf28171df0.png?resizew=254)
![](https://img.xkw.com/dksih/QBM/2021/11/5/2844863982624768/2846312310013952/STEM/02aade84-66ed-4973-8695-e46892410ba2.png?resizew=183)
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【推荐3】(1)等边三角形△ABC中,点D是AB边所在直线上的一动点(D与A、B不重合),连接DC,以DC为边在BC边上方作等边三角形△DCE,连接AE,
①如图1,当D在线段AB上时,∠ABC与∠EAC有怎样的数量关系直接写出结论
②如图2,当D在BA延长线上时,求证:∠ABC=∠EAC
③如图3,当D在AB延长线上时,探究∠ABC与∠EAC的数量关系,直接写出结论
(2)等腰三角形△ABC中,AB=AC,点D是AB边上一动点(D与A、B不重合),如图4,连接DC,以DC为边在BC边上方作等腰三角形△DCE,使顶角∠DEC=∠BAC,连接AE,探究∠ABC与∠EAC的数量关系,给予证明
①如图1,当D在线段AB上时,∠ABC与∠EAC有怎样的数量关系直接写出结论
②如图2,当D在BA延长线上时,求证:∠ABC=∠EAC
③如图3,当D在AB延长线上时,探究∠ABC与∠EAC的数量关系,直接写出结论
(2)等腰三角形△ABC中,AB=AC,点D是AB边上一动点(D与A、B不重合),如图4,连接DC,以DC为边在BC边上方作等腰三角形△DCE,使顶角∠DEC=∠BAC,连接AE,探究∠ABC与∠EAC的数量关系,给予证明
![](https://img.xkw.com/dksih/QBM/2017/10/5/1788868421107712/1789166027120640/STEM/bfdb766bac434c00a106be3244d59825.png?resizew=494)
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名校
【推荐1】如图,矩形
中,
,
,点
在折线
上运动,将
绕点
顺时针旋转得到
,旋转角等于
,连接
.
在
上时,作
,垂足为
,求证
;
(2)当
时,求
的长;
(3)连接
,点
从点
运动到点
的过程中,直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.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/790d5327d89fc1b3145e546482a46a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4714e33baa77ada39336c475a4be1cbe.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb89a4a0c99a3ed9a193711a2126dba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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解答题-证明题
|
较难
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【推荐2】数学课上,老师提出一个问题:如图
,已知等腰直角
,
,等腰直角
,
,连结
,
为
中点,连结
,
,请探究线段
,
之间的关系.
小明通过思考,将此探究题分解成如下问题,逐步探究并应用,请帮助他完成:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/3a5d6b0d-d1dd-49c0-9017-a5ff78484c94.png?resizew=589)
(1)如图
,延长
至
,使得
,连结
,则线段
与线段
的数量关系为______,位置关系为______;
(2)如图
,延长
交
延长线于点
,连结
,
,小明的思路是先证明
,进而得出
与
的关系,再继续探究,请判断线段
,
之间的关系,并根据小明的思路,写出完整的证明过程;
(3)方法运用:如图
,等边
与等边
,点
,
在
外部,
,
,连结
,点
为
中点,连结
,
,若
,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](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/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d831c9ba6d18774540e2aaa29132fec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
小明通过思考,将此探究题分解成如下问题,逐步探究并应用,请帮助他完成:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/22/3a5d6b0d-d1dd-49c0-9017-a5ff78484c94.png?resizew=589)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb430059ddfa0934e039dbd26836886b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968b886a9f161fdcab1e08cba8ece5d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/968b886a9f161fdcab1e08cba8ece5d0.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8626fa292891430fa94cc8af7405a590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a21897349d3d7c94419692106887153.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)方法运用:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5490dba7da9a3f60c2f9440b2ddd0162.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae341f580ff8fbf21f616fe900b0e4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐1】如图,在矩形
中,点
、点
分别在
轴和
轴上,点
.抛物线
经过
两点,交
的延长线于点
,与
轴另一个交点为
,且
.
![](https://img.xkw.com/dksih/QBM/2021/1/16/2636958212784128/2644455801561088/STEM/735ec2d5-f2d8-4819-8f73-eb062e1fb5a0.png)
(1)求抛物线的表达式;
(2)点
是直线
上方抛物线上的一个动点,
轴,
,垂足为
.
①猜想:
与
的数量关系,并证明你的猜想;
②设
的长为
,点
的横坐标为
,求
与
的函数表达式,并求
的最大值.
(3)如果
是抛物线对称轴上一点,在抛物线上是否存在一点
,使得以
为顶点的四边形是平行四边形?若存在,直接写出点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/266504a4bd910b292c74765dc9772f62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/070bc896d35495237fd65576e9b6f88e.png)
![](https://img.xkw.com/dksih/QBM/2021/1/16/2636958212784128/2644455801561088/STEM/735ec2d5-f2d8-4819-8f73-eb062e1fb5a0.png)
(1)求抛物线的表达式;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b3bd27cc8d027d29f41c1e6e50cb5c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f10966af97a837c746750ef3f75fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
①猜想:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)如果
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34dea7b5e713d1562911e0e651defea4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,在
中,
,
,
.动点
从点
出发,以每秒1个单位长度的速度沿
向点
运动,同时点
从点
出发,以每秒2个单位长度的速度沿
向终点
运动,以
、
为邻边作
,当点
到达点
时,点
也随之停止运动,设点
运动的时间为
秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/41859166-81c6-467c-b933-54aefb045cc9.png?resizew=164)
(1)用含
的代数式表示
的长;
(2)当
时,求
的值;
(3)当点
落在
一边的垂直平分线上时,直接写出
的值.
![](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/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/846bf4aa126c0a45a378e1a8fe499b5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/41859166-81c6-467c-b933-54aefb045cc9.png?resizew=164)
(1)用含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次