如图1,二次函数y=ax2﹣2ax﹣3a(a<0)的图象与x轴交于A、B两点(点A在点B的右侧),与y轴的正半轴交于点C,顶点为D.
![](https://img.xkw.com/dksih/QBM/2021/12/9/2868706205229056/2869404913491968/STEM/be1c5644-b709-42ba-8a2d-914be697c2ef.png?resizew=490)
(1)求顶点D的坐标(用含a的代数式表示).
(2)若以AD为直径的圆经过点C.
①求a的值.
②如图2,点E是y轴负半轴上一点,连接BE,将△OBE绕平面内某一点旋转180°,得到△PMN(点P、M、N分别和点O、B、E对应),并且点M、N都在抛物线上,作MF⊥x轴于点F,若线段BF=2MF,求点M、N的坐标.
③如图3,点Q在抛物线的对称轴上,以Q为圆心的圆过A、B两点,并且和直线CD相切,求点Q的坐标.
![](https://img.xkw.com/dksih/QBM/2021/12/9/2868706205229056/2869404913491968/STEM/be1c5644-b709-42ba-8a2d-914be697c2ef.png?resizew=490)
(1)求顶点D的坐标(用含a的代数式表示).
(2)若以AD为直径的圆经过点C.
①求a的值.
②如图2,点E是y轴负半轴上一点,连接BE,将△OBE绕平面内某一点旋转180°,得到△PMN(点P、M、N分别和点O、B、E对应),并且点M、N都在抛物线上,作MF⊥x轴于点F,若线段BF=2MF,求点M、N的坐标.
③如图3,点Q在抛物线的对称轴上,以Q为圆心的圆过A、B两点,并且和直线CD相切,求点Q的坐标.
21-22九年级上·江苏无锡·阶段练习 查看更多[4]
江苏省宜兴市树人中学教育集团2021-2022学年九年级上学期第二次阶段测试数学试题(已下线)2022年江苏省扬州市中考数学变式题24-28(已下线)2022年江苏省扬州市中考数学真题变式汇编42023年广东省湛江市雷州市中考二模数学试题
更新时间:2021-12-10 10:42:09
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名校
解题方法
【推荐1】如图,抛物线
的对称轴为直线
,且抛物线经过
两点,与x轴交于点N.
![](https://img.xkw.com/dksih/QBM/2021/12/12/2870785371824128/2871636458192896/STEM/4cdfb060-8918-4e08-aea1-5d59489e6760.png?resizew=299)
(1)点N的坐标为_______.
(2)已知抛物线
与抛物线C关于y轴对称,且抛物线
与x轴交于点
(点A在点
的左边).
①抛物线
的解析式为_________;
②当抛物线
和抛物线C上y都随x的增大而增大时,请直接写出此时x的取值范围.
(3)若抛物线
的解析式为
,抛物线
的顶点为
,与x轴的交点为
(点A在点
的左边).
①求
的值;
②判断抛物线的顶点
是否在一条直线上,若在,请直接写出该直线的解析式;若不在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec850f00cfa23f06d762ab31f6e248e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c6875d552e9fff3c7d655f3a59b166.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af65c655342dbbb75a522f9ef193369.png)
![](https://img.xkw.com/dksih/QBM/2021/12/12/2870785371824128/2871636458192896/STEM/4cdfb060-8918-4e08-aea1-5d59489e6760.png?resizew=299)
(1)点N的坐标为_______.
(2)已知抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd5885f7a8c60fca89647998e37b8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
①抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
②当抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
(3)若抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c3c0bdb6e7db0e2ce1007fac7ee1fa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc31dcdb99754fc452ff2b92a2fb8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf83e20035c3afd6d26ebfd53d768a70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d7d157f134190fb49a7b7ad0c6638b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f5c583c98a1fd516c6ceaa60b55dec.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1277f9b0ac7af129cc4e7bf59af76792.png)
②判断抛物线的顶点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df2387dc0dfdccb80b9d049cc2df1ef9.png)
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【推荐2】设二次函数
(
是常数).
时,求二次函数
的顶点坐标.(用含
的代数式表示)
(2)若
时,求二次函数
的最大值.(用含
的代数式表示)
(3)若
时,如图,直线
与此函数图象交于
两点,点
不在二次函数图象上,线段
分别交二次函数图象于点
,且
,求点
的纵坐标的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d8bf01092d97f3c2d199f25bda462b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9a475fec8ded321e10a6697319fb975.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3c442579603164f3fc19458677d307.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/239ea0e903fbb4c8ce04133b9969578c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5525e928148272377592964c45c76abb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62a992bf546c85dc454aa6778ff678f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab466aedd6e176088d8dee7bc3e3aaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39acab3cfb59bfc9591371721ab01d93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942eb0d83783438d738a0ec3fad08e3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】如图,在
中,
,
,一直线
从
点开始以每秒
的速度开始向下移动,且
,当
与
![](https://img.xkw.com/dksih/QBM/2018/10/1/2044264751448064/2044869489590272/STEM/88b1dd115af14799a8a447117bd3a46c.png?resizew=79)
重合为止.如果设运动了
时夹在
,
之间的线段
长为
.
求
与
的函数关系式,并求
的取值范围;
写出梯形
的面积
与
的函数关系式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/409101382858c780262c12640d1a4132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6bd86d037ed3a20ea941b15ea9bd99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d1644cf206f4f0aa63172ba7f0271b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afe51dede0ec324417524a3fef8cf645.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://img.xkw.com/dksih/QBM/2018/10/1/2044264751448064/2044869489590272/STEM/88b1dd115af14799a8a447117bd3a46c.png?resizew=79)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f3fb7f4942059a60468dc501ada8134.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0215e13a9fb5574d5194aeb9507a98aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/329801ede11867113c9cf51f31083b75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64f5fd229218d333adbe9b324e80157.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】如图抛物线
与x轴交于点A,B,与y轴交于点C.直线
经过点A,C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/bd4c5081-0470-4c1a-8f46-ee77a00a868b.png?resizew=154)
(1)抛物线的解析式为________________________,点B的坐标为________________;
(2)若点P是第一象限内抛物线上一点,连接BP并延长交直线AC于点E,当
时,求点P的横坐标.
(3)若点G是抛物线上一点,点H是x轴上一点,是否存在这样的点G,H,使以点A,C,G,H为顶点的四边形是平行四边形?若存在,请求出点G的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c9800e4b992044d16681e77ff6563c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aae342dcb93e0e6f017093cacc5ac977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/bd4c5081-0470-4c1a-8f46-ee77a00a868b.png?resizew=154)
(1)抛物线的解析式为________________________,点B的坐标为________________;
(2)若点P是第一象限内抛物线上一点,连接BP并延长交直线AC于点E,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09de6bc03bcf984c84aebc72352da50d.png)
(3)若点G是抛物线上一点,点H是x轴上一点,是否存在这样的点G,H,使以点A,C,G,H为顶点的四边形是平行四边形?若存在,请求出点G的坐标;若不存在,请说明理由.
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【推荐1】如图1,在
中,
,
,
,点O在边
上,由点D向点A运动,当点O与点A重合时,停止运动.以点O为圆心,
为半径在
的下方作半圆O,半圆O与
交于点M.(
,
,
)
(1)如图1,当
时,
______°,点
到半圆
的最短距离
______;
(2)半圆
与
相切时,求
的长?
(3)如图2,半圆
与
交于点E、F,当
时,求扇形
的面积?
(4)以
,
为边矩形
,当半圆
与
有两个公共点时,则
的取值范围是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/681a4c0e1bba3332b0dde5ce55d30e2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca68b20c20255d5a666427d913e5de5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61719b93fffcf4db181c9e9d9b4f46b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0510f27619c9cf7c3957038c72db12a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dc6f949860268a174dffc1de255e62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/17/baa63387-c145-4031-872b-b5c75de9940f.jpg?resizew=420)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d411efb0aacd95470c63f3a03a6bd034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13d2510a824d2bb56374f5fd9c8c4958.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
(2)半圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
(3)如图2,半圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b6df3e463234f4e6da8c380d0e2a380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2935a591c968df92a8cdd2bf09d96452.png)
(4)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
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【推荐2】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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解答题-作图题
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【推荐3】在平面直角坐标系
中,对于点
和
,若以
为圆心,
为半径画弧,且该弧顺次经过
上两点
、
,满足
,则称这条点
、
之间过点
的弧为
关于点
的满意弧,
为
关于点
的满意角.例如,图
中经过点
、
、
的弧是
关于点
的满意弧,
是
关于点
的满意角.
(1)如图2,已知点
的坐标为
,
的半径为
,
①在图2中画出
关于点
的满意弧,并直接写出该弧的弧长;
②点
是直线
上的动点,在图3中画出
关于点
的满意角最大时的满意弧,并求此时满意弧的满意角;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/de96a8ad-8c8c-460d-9f02-14c4365fcf1a.png?resizew=297)
(2)
的圆心在
轴上,半径为
,点
在
轴上,若对于
,至少存在一个点
能画出
关于它的满意弧,直接写出圆心
的纵坐标
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0101a7b5c8a4aed0de2af363792e39a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](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/4711eb1596d35616bf67eb5710787292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb36b468609ddd66b9385155c640dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](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/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb36b468609ddd66b9385155c640dbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/98d22b2c-8da7-4a37-8551-072bf961ff26.png?resizew=158)
(1)如图2,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53a948d2f7732d7f03e986c63712089b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
①在图2中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6fccc3468aeb5faa3715c44b87c9afa.png)
②点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1d8d5cea065075fe50706abe3ae802.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/de96a8ad-8c8c-460d-9f02-14c4365fcf1a.png?resizew=297)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/29/67bc0fed-0be1-4fd0-a136-1cd5c18f18e8.png?resizew=297)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/669e8dfb2b45e6f74d86408343a18fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐1】如图,
中,
,垂足为B,点D在直线
上,连接
,将线段
绕点C逆时针旋转60°,得到线段
,连接
,直线
与直线
相交于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/e6a8ef44-cd41-459c-8957-05bb98e0f05d.png?resizew=351)
(1)连接
,请直接写出线段
与线段
的数量关系;
(2)猜想线段
与线段
的数量关系,并说明理由;
(3)若
,请直接写出线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84e16847be9fb114742656e9fc15586a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/10/e6a8ef44-cd41-459c-8957-05bb98e0f05d.png?resizew=351)
(1)连接
![](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/d40b319212a7e7528b053e1c7097e966.png)
(2)猜想线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c899654073101b2bdedb0063566ee06c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】已知
是边长为6的等边三角形,点
是射线
上的动点,将线段
绕点
顺时针方向旋转
得到线段
,连接
.
;
(2)如图2,当
等于多少时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa80cfd38f59e5cbbb30628d03113689.png)
(2)如图2,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/285ae02ccfd802df907ba97ac2959ff3.png)
您最近一年使用:0次