如图1,
,
是两个等腰直角三角形,其中
,
,
,连接
,取
中点F,连接
.
与
的数量关系与位置关系;
(2)如图2,将
绕点C逆时针旋转,取
与
的中点G,H,当点G,H,F三点不共线时,连接
,求证:
;
(3)在(2)的条件下,连接
,在
绕点C旋转的过程中,求
面积的最小值,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa74660971ce04b1041ecec0462e87e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95542ef7e3e4d47c2b9e71ff4257392a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7a1efba81016d27d41b262b75e8e6e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43f89255b1b29e4856b56fdc831cee66.png)
(3)在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f850c705372b8a85489505da53239fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25d95565e1e7f522624ed32e5a61199.png)
2023·贵州贵阳·一模 查看更多[4]
2023年贵阳市云岩区中考一模数学试题广东省深圳市宝安区海旺学校2023-2024学年九年级上学期开学考数学试题广东省深圳市宝安区2023-2024学年九年级上学期开学考试数学试题(已下线)专题05 平行四边形与旋转问题压轴题专项训练-【好题汇编】2023-2024学年八年级数学下学期期中真题汇编(广东专用)
更新时间:2023-12-21 16:54:59
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【推荐1】如图,矩形
中,
,
,E是对角线
上一点,连接
,作
,交
延长线于点F.
(1)若
是等腰三角形,直接写出
的长_____;
(2)若
是等腰三角形,求
的长;
(3)若
成立,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40fe2cc764de5fa58e9d90d750c5c528.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/10bd739a-63c7-44ca-b65f-969dbbcefbd0.png?resizew=112)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c3a4638e2eb4e684b73416fb6a0f344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/608234efd766c503083c1192f34ee2cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
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【推荐2】如图1,△ABC中,CD⊥AB于D,且BD:AD:CD=2:3:4,
(1)试说明△ABC是等腰三角形;
(2)已知
=160cm²,如图2,动点M从点B出发以每秒2cm的速度沿线段BA向点A运动,同时动点N从点A出发以相同速度沿线段AC向点C运动,当其中一点到达终点时整个运动都停止,设点M运动的时间为t(秒),
①若△DMN的边与BC平行,求t的值;
②若点E是边AC的中点,问在点M运动的过程中,△MDE能否成为等腰三角形?若能,求出t的值;若不能,请说明理由.
(1)试说明△ABC是等腰三角形;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5cbff84327e964f912a54032e76ccc9.png)
①若△DMN的边与BC平行,求t的值;
②若点E是边AC的中点,问在点M运动的过程中,△MDE能否成为等腰三角形?若能,求出t的值;若不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/11/18/2595766411362304/2598507518918656/STEM/9f4a725edebc48f0af2a7acaf1f40477.png?resizew=532)
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【推荐3】(1)如图1,四边形ABCD中,BC=
,AD=
,CD=
,∠A=120°,∠ADC=90°,求四边形对角线BD的长;
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962075516395520/2962861670334464/STEM/f07a3444-9749-4768-84c7-99a5fb271192.png?resizew=184)
(2)如图2,四边形ABCD是某农业种植基地的的试验田,AB=BC=CD=6km,∠ABC=60°,∠BCD=150°,点E为一处灌溉井,E在AB上,BE=4km,为提升种植质量和产量,现过点E建一条笔直的浇灌水渠l,并改动点A的位置至A'处,使得A′与B关于l对称.改建试验田(四边形A'BCD)时,面积是否有最大值?如果有,当面积最大时,求A'B的长及此时水渠l与AB所夹锐角的度数;如果没有,说明理由.(结果保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01961669cd597f61fa48e9853d678bb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c27ff057bd4c1e5c216ed4e338af8949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7881094ce2f907c3aaf664318ecd3e2d.png)
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962075516395520/2962861670334464/STEM/f07a3444-9749-4768-84c7-99a5fb271192.png?resizew=184)
(2)如图2,四边形ABCD是某农业种植基地的的试验田,AB=BC=CD=6km,∠ABC=60°,∠BCD=150°,点E为一处灌溉井,E在AB上,BE=4km,为提升种植质量和产量,现过点E建一条笔直的浇灌水渠l,并改动点A的位置至A'处,使得A′与B关于l对称.改建试验田(四边形A'BCD)时,面积是否有最大值?如果有,当面积最大时,求A'B的长及此时水渠l与AB所夹锐角的度数;如果没有,说明理由.(结果保留根号)
![](https://img.xkw.com/dksih/QBM/2022/4/20/2962075516395520/2962861670334464/STEM/c3fdf0d6-9b16-49db-bd2c-63d4c7ee529b.png?resizew=240)
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【推荐1】定义:对角线相等且所夹锐角为
的四边形叫“
等角线四边形”.
如图1,四边形
为“
等角线四边形”,即
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/2b676b2c-5202-4441-a46e-4a99656b7d25.png?resizew=445)
判定探究:
(1)下列语句能判断四边形是“
等角线四边形”的是 .(填序号)
①对角线所夹锐角为
的平行四边形;
②对角线所夹锐角为
的矩形;
③对角线所夹锐角为
,且顺次连接各边中点所形成的四边形是菱形的四边形.
(2)性质探究:以
为边,向下构造等边三角形
,连接BE,如图2,请直接写出
与
的大小关系;
(3)请判断
与
的大小关系,并说明理由;
(4)学习应用:若“
等角线四边形”的对角线长为4,则该四边形周长的最小值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
如图1,四边形
![](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/1c3f4b404cacd3a7523f6fd57e6159e0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/2b676b2c-5202-4441-a46e-4a99656b7d25.png?resizew=445)
判定探究:
(1)下列语句能判断四边形是“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
①对角线所夹锐角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
②对角线所夹锐角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
③对角线所夹锐角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
(2)性质探究:以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1aac055263010139f6eb4df68f9d619.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(3)请判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57041caba590305ccb37a3a7fbd2a14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f8c5076f7a4391faa5f3ae8c8efd477.png)
(4)学习应用:若“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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【推荐2】已知:在Rt△ABC中,AB=BC,在Rt△ADE中,AD=DE;连结EC,取EC的中点M,连结DM和BM.
(1)若点D在边AC上,点E在边AB上且与点B不重合,如图1,
求证:BM=DM且BM⊥DM;
(2)如果将图1中的△ADE绕点A逆时针旋转小于45°的角,如图2,那么(1)中的结论是否仍成立?如果不成立,请举出反例;如果成立,请给予证明.
(1)若点D在边AC上,点E在边AB上且与点B不重合,如图1,
求证:BM=DM且BM⊥DM;
(2)如果将图1中的△ADE绕点A逆时针旋转小于45°的角,如图2,那么(1)中的结论是否仍成立?如果不成立,请举出反例;如果成立,请给予证明.
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【推荐1】如图所示,
为
的直径,
、
、
分别与
相切于点
、
、
.连接
并延长与直线
相交于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/c1f8356a-6d58-491e-a1cf-27615cc4f9e0.png?resizew=162)
(1)求证:
;
(2)若
,求
的值;
(3)在(2)条件下,若
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/41cc27ddfd7a64940f6c89aad95bb607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/c1f8356a-6d58-491e-a1cf-27615cc4f9e0.png?resizew=162)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d8ce3af4777d0267b103c1efe8513c5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca549d4726e97bb31edf4d11338ffc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7845c7b5f7137a2e3a5e1aa3d7d5f6.png)
(3)在(2)条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e1b8b88ac99f35614775320c230c3cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】某班级同学在数学老师的指导下,以“等腰三角形的旋转”为主题,开展数学探究活动.
【特例操作】
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/11/229314d5-e836-4607-88e3-d4a7bfbb767a.png?resizew=450)
(1)如图1,
中,
,将
绕点O逆时针旋转180°,得到
,连接
,F是
的中点,连接
,则
与
的数量关系是______;
【迁移探究】
(2)如图2,
中,
,将△OAB绕点O顺时针旋转,得到
,连接
,F是
的中点,连接
,当
时,求
与
的数量关系;
【拓展应用】
(3)按(1)中将
绕点O逆时针旋转一定的角度,得到
,且
,其它条件不变,当
或
时,请直接写出
的长.
【特例操作】
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/11/229314d5-e836-4607-88e3-d4a7bfbb767a.png?resizew=450)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73f2cd1460c69ce0517b6bb81ef49e26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e00bf73d03dded1cf5f83cc5339361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【迁移探究】
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d55c8508b6f761d63cb3c8e67bd9c4e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e00bf73d03dded1cf5f83cc5339361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83940bc74f07a71ce38af3d3c0f79df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【拓展应用】
(3)按(1)中将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e00bf73d03dded1cf5f83cc5339361.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/337fb300c2aa101232d487dd19596e49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb34acf4ee03bf3f3801ab644a0e209.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】(1)如图1,点
是
内一点,
,
,则
(直接写出结果);
(2)如图2,
是
外一点,满足
,
,求
的度数;
(3)如图3,
是
内一点,
,
,
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30fc65a72853bd8ac1ad0828270d3baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f4cb33cdb3e2994ac7b9a0abbabed2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4397f6e86c69e6b597e7e8635afbfb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83873a9d782f2588c5eedbfe73f9bc2f.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30fc65a72853bd8ac1ad0828270d3baf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c383691e8d740830a865b12d66f7633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60faf3a9bc2daab1f386ec116d74b703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/05ef5dcd-d447-406c-a266-f444141a2cf7.png?resizew=359)
您最近一年使用:0次
解答题-作图题
|
较难
(0.4)
【推荐2】已知:
中,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c3e1e0e7938fcce6a0ecd70c14b480.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/bf69c3a2-4336-4c38-82d1-9301a966da49.png?resizew=177)
(1)尺规作图:求作
的中点
,连
并延长,交
于点
(保留作图痕迹,不写作法)
(2)从条件①、条件②这两个条件中选择一个作为已知条件,求
的余弦值.
条件①:
和
的面积为
和
,且
;
条件②:
和
的周长为
和
,且
.
注:如果选择条件①和条件②分别作答,按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc386123ce6070a9dfb8a9a01d1f56c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c3e1e0e7938fcce6a0ecd70c14b480.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/bf69c3a2-4336-4c38-82d1-9301a966da49.png?resizew=177)
(1)尺规作图:求作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc93e193fad261689949a52819753f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)从条件①、条件②这两个条件中选择一个作为已知条件,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
条件①:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4686f39b38d5b90309ee73ed89a0640.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a047be86379e0a784173c1f5c633f3b7.png)
条件②:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bbf9680f74a9ac5d934304654ce2771.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cd0a7d3cffdc1d3f1beba80d435b0df.png)
注:如果选择条件①和条件②分别作答,按第一个解答计分.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐3】我们约定[a,
b,c]为二次函数
的“相关数”.
【特例感知】
“相关数”为[1,4,3]的二次函数的解析式为
,
“相关数”为[2,5,3]的二次函数的解析式为
;
“相关数”为[3,6,3]的二次函数的解析式为
;
(1)下列结论正确的是____________(填序号).
①抛物线
,
,
都经过点
;
②抛物线
,
,
与直线
都有两个交点;
③抛物线
,
,
有两个交点.
【形成概念】
把满足“相关数”为[n,n+3,3](n为正整数)的抛物线
称为“一簇抛物线”,分别记为
,
,
,…,
.抛物线
与
轴的交点为
,
.
【探究问题】
(2)①“—簇抛物线”
,
,
,…,
都经过两个定点,这两个定点的坐标分别为 .
②拋物线
的顶点为
,是否存在正整数
,使![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
是直角三角形?若存在,请求出
的值;若不存在,请说明理由.
③当
时,抛物线
与
轴的左交点
,与直线
的一个交点为
,且点
不在
轴上.判断
和
是否相等,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b700fa9aeb1016aa71f76e4b6bb212e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
【特例感知】
“相关数”为[1,4,3]的二次函数的解析式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a32d30dc00f0bac2ac24ac33155e02bb.png)
“相关数”为[2,5,3]的二次函数的解析式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75e5b1a32d2e99834090d5bb4c054425.png)
“相关数”为[3,6,3]的二次函数的解析式为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a97bee8fd4e9671fc85fe26c70fa6b.png)
(1)下列结论正确的是____________(填序号).
①抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb0e705301752424a492f6277ed7774e.png)
②抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9355031ea0b2dc9cef3777621bc6d38.png)
③抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
【形成概念】
把满足“相关数”为[n,n+3,3](n为正整数)的抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f5c583c98a1fd516c6ceaa60b55dec.png)
【探究问题】
(2)①“—簇抛物线”
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54015ff5b49e3283901da1291b6b921d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46f6872ffb1934339c53c2c2282d5889.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9314bd1d7a6e070f4f2428f9a321804e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
②拋物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b16bcb02274d0901043bc21de092a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5818ede14d21f6df9ef9c2bfe09286c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a79b9eaa5e7ab7a1e5c512b571914dc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9355031ea0b2dc9cef3777621bc6d38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66d4e8502106802f1485c3b0f28f2664.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5d6940ef122dcb071e361c7161c82b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ea3ca3794b4388d3b2169c293e8c2.png)
您最近一年使用:0次