如图,在平面直角坐标系中,直线
与
轴交于点
,与
轴交于点
,抛物线
经过点
和点
,与
轴交于另一点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/1170240c-608a-49fa-8d97-7c6c3450609a.png?resizew=566)
(1)求抛物线表达式;
(2)在第二象限的抛物线上有一点
,且点
到线段
的距离为
,求点
的坐标;
(3)矩形
的边
在
轴的正半轴,
在第一象限,
,
,将矩形
沿
轴负方向平移![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
,直线
、
分别交抛物线于
、
.问:是否存在实数
,使得以点
、
、
、
为顶点的四边形是平行四边形?若存在,请直接写出
的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c608def11fa0e2b34f05592ef1d11fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/1170240c-608a-49fa-8d97-7c6c3450609a.png?resizew=566)
(1)求抛物线表达式;
(2)在第二象限的抛物线上有一点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6370d6c626bdabf1fc694501ee6c714f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84f169e50dc59d4f7a8e1e36f5c847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a363df9127fb019f87ec53470c50dcc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](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/36a1b09c653185842513e24ebba60bb3.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2020-06-10 00:34:09
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相似题推荐
解答题-问答题
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解题方法
【推荐1】如图(1),四边形ABCD的顶点A、D、C分别在x、y轴的正半轴上,AD∥BC,OC=4cm.动点E从点C出发,沿C→D→A→B→C匀速运动,动点F以每秒1cm的速度从C出发沿线段CB向点B来回运动,当E点运动到点C点时,两点同时停止运动.若点E、F同时出发运动t秒后,如图(2)是△OEC的面积S(cm2)与t(秒)的函数关系图象,以线段EF为斜边向右作等腰直角△EFG.
(1)填空:点E的运动速度是 ,B点坐标为 .
(2)当0≤t<4秒时,
①t为何值时,以O、C、E为顶点的三角形与△BFG相似?
②是否存在这样的时刻t,使点G正好落在线段AB上,若存在,求此时的t,若不存在,请说明理由.
(1)填空:点E的运动速度是 ,B点坐标为 .
(2)当0≤t<4秒时,
①t为何值时,以O、C、E为顶点的三角形与△BFG相似?
②是否存在这样的时刻t,使点G正好落在线段AB上,若存在,求此时的t,若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/c3ab817c-b6ca-4139-943a-d1647a445701.png?resizew=333)
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【推荐2】如图所示,在平面直角坐标系中,现将一块等腰直角三角板ABC放在第二象限,斜靠在两坐标轴上,点C(-1,0),过点B作BD⊥x轴,垂足为点D,且B点横坐标为-3.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/de70c2a0-d90f-4761-a616-fef4f58e7d9a.png?resizew=198)
(1)求证:△BDC≌△COA;
(2)求BC所在直线的函数关系式;
(3)在直线
上是否存在点P,使△ACP是以AC为直角边的直角三角形?若存在,求出所有点P的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/de70c2a0-d90f-4761-a616-fef4f58e7d9a.png?resizew=198)
(1)求证:△BDC≌△COA;
(2)求BC所在直线的函数关系式;
(3)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c98a7f3a8bf384b1dfc1d34aebd46d2.png)
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【推荐1】定义:平面直角坐标系中有点
, 若点
满足
且
,则称点
为中心点,点
是点
的 “
界环绕点”.例如:对于中心点
,满足
且
的点,都是点
的“
界环绕点”,这些环绕点组成的图形是一个边长为
的正方形,中心点
是正方形的中心.
(1)点
的“
界环绕点”所组成的图形面积为 ;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(2)直线
经过点
.
①在其图象上,点
的“
界环绕点”组成的线段长为
,求b的值;
②直线
与反比例函数
图象的交点横坐标为
,求
的取值范围;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
(3)关于
的二次函数
(
是常数),将它的图象
绕原点
逆时针旋转
得曲线
,若
与
上都存在
的“1界环绕点”,直接写出
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90688751e58655291204fab149e744e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2016861d466b9315a1f8fa5418f6a3ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a44f1ef5679987b4b8689653d6e280b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62eb43420267c0818d5cd3dc30ca5f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90688751e58655291204fab149e744e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff32d26c8d44f5fb4813a19c1030a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbfb09254f7af674498b40654c39e3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18533c0e07cca0d9d92044bdfa6ef799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff32d26c8d44f5fb4813a19c1030a9f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff32d26c8d44f5fb4813a19c1030a9f5.png)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430b9c003e6f16136fd9ef43654b2b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ececd20089801c2228b63367418703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d324a2787113298f3d284f0ade14bcd.png)
①在其图象上,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c451e1159edb958b5567ecf6fa23dae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20838e72faf737614d76fcee82ab6c5.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37b2da9ebfa1f11587fd24cb7f8310dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c10d4a5afd50bbe6d384ead2a92bb30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd8ca3aa2d1ba52e82613d0d65d800e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24acaad3e4a83c102702155e5df281e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
(3)关于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a939330c156bfa5d2351c0da5c94117.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781b089662bf214668aae489bda55497.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
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【推荐2】如图,在平面直角坐标系中,二次函数
的图象经过点
、
,点P为抛物线上一动点,其横坐标为
.
(2)若此抛物线在点P右侧部分(包括点P)的最低点的纵坐标为
时,求m的值.
(3)已知点
,点
,以
为邻边作
.
①当抛物线在
内部的部分的函数值y随x的增大而增大时,直接写出m的取值范围;
②当抛物线在
内部的部分的函数值y随x的增大而增大或y随x的增大而减小时,抛物线与
的边交点的纵坐标之差为
时,直接写出m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d8bf01092d97f3c2d199f25bda462b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e357eebd36c7985f6624b016be0edff3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edd81cac5d2bcf0753819951088027d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5726ebd95b22e5f7971028479790df77.png)
(2)若此抛物线在点P右侧部分(包括点P)的最低点的纵坐标为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c629bf732741f8541d7752d74c0c0a2.png)
(3)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/132bff6c4d271a7a159dfb27fcc0b85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505485e7ac0cb4ca7759a8cc104ce41e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/531f716fca8ebf251b330b1e4370c5fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b47bf03ef471d4b8c281ca4a6c49053.png)
①当抛物线在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b47bf03ef471d4b8c281ca4a6c49053.png)
②当抛物线在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b47bf03ef471d4b8c281ca4a6c49053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b47bf03ef471d4b8c281ca4a6c49053.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
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【推荐1】如图 1,在平面直角坐标系中,O 是坐标原点,长方形 OACB 的顶点 A、B 分别在 x 轴与 y 轴上,已知 OA=6,OB=10.点 D 为 y 轴上一点,其坐标为(0,2), 点 P 从点 A 出发以每秒 2 个单位的速度沿线段 AC﹣CB 的方向运动,当点 P 与点 B 重合 时停止运动,运动时间为 t 秒.
(1)当点 P 经过点 C 时,求直线 DP 的函数解析式;
(2)如图②,把长方形沿着 OP 折叠,点 B 的对应点 B′恰好落在 AC 边上,求点 P 的坐标.
(3)点 P 在运动过程中是否存在使△BDP 为等腰三角形?若存在,请求出点 P 的坐标;若 不存在,请说明理由.
(1)当点 P 经过点 C 时,求直线 DP 的函数解析式;
(2)如图②,把长方形沿着 OP 折叠,点 B 的对应点 B′恰好落在 AC 边上,求点 P 的坐标.
(3)点 P 在运动过程中是否存在使△BDP 为等腰三角形?若存在,请求出点 P 的坐标;若 不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2018/11/27/2084633519276032/2085960994758656/STEM/aa7fef86878a49d6b21ce910481fbb52.png?resizew=462)
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【推荐2】如图l所示,在直角梯形ABCD中,∠BAD=90°,E是直线AB上一点,过E作直线
∥BC,交直线CD于点F.将直线
向右平移,设平移距离BE为
,直角梯形ABCD被直线
扫过的面积(图中阴影部分)为S,S关于
的函数图象如图2所示,OM为线段,MN为抛物线的一部分,NQ为射线,N点横坐标为4.
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/51933ab8-3cd4-4fd7-a23e-9ebacf153aaa.png?resizew=488)
(1)AB=________;CD=__________;梯形ABCD的面积为_______(直接写出答案);
(2)当
时,求S关于
的函数关系式;
(3)当
为何值时,直线
将直角梯形ABCD分成的两部分面积之比为1:3.
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/21640eab854d427891dcf77daa9a271b.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/21640eab854d427891dcf77daa9a271b.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/738b486334274202abfe9c4a08a3b4e0.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/21640eab854d427891dcf77daa9a271b.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/485d23bd1728415a9fa99029762b4ae1.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/51933ab8-3cd4-4fd7-a23e-9ebacf153aaa.png?resizew=488)
(1)AB=________;CD=__________;梯形ABCD的面积为_______(直接写出答案);
(2)当
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/c2b315499dd54cc79dede0f5a3bca521.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/485d23bd1728415a9fa99029762b4ae1.png)
(3)当
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/485d23bd1728415a9fa99029762b4ae1.png)
![](https://img.xkw.com/dksih/QBM/2015/6/15/1573848128307200/1573848134696960/STEM/21640eab854d427891dcf77daa9a271b.png)
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(0.4)
【推荐3】如图,已知Rt△ABC中,∠A=30°,AC=6.边长为4的等边△DEF沿射线AC运动(A、D、E、C四点共线).当等边△DEF的边DF、EF与Rt△ABC的边AB分别相交于点M、N(M、N不与A、B重合)时,设AD=x.
(1)则△FMN的形状是_______,△ADM的形状是_______;
(2)△ABC与△DEF重叠部分的面积为y,求y关于x的函数解析式,并写出的取值范围;
(3)若以点M为圆心,MN为半径的圆与边AC、EF同时相切,求此时MN的长.
(1)则△FMN的形状是_______,△ADM的形状是_______;
(2)△ABC与△DEF重叠部分的面积为y,求y关于x的函数解析式,并写出的取值范围;
(3)若以点M为圆心,MN为半径的圆与边AC、EF同时相切,求此时MN的长.
![](https://img.xkw.com/dksih/QBM/2017/5/4/1679723994906624/1736859525062656/STEM/e954c087-0530-4a55-a584-694e7a2cbada.png?resizew=201)
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解答题-问答题
|
较难
(0.4)
名校
【推荐1】如图:在平面直角坐标系
中,正方形
的两边分别在
轴和
轴上,对角线
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/feba7d67-8ead-4d1f-8c4a-f404ba48838a.png?resizew=357)
(1)求
点的坐标;
(2)
为
内部一点,连接
,将
沿
翻折,
的对应点为
,连接
,设
的横坐标为
,
的面积为
,求
与
的关系式;
(3)在(
)的条件下,连接
,若
,
,平面内是否存在一点
,使以
为顶点的四边形是平行四边形,若存在求出
点坐标,若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7795aec93c2c7ac2fd93e6747ca6516c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9040cff7e9e20dd2817ad9888237d8.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/60541590ef3c5dd7248f4b1484088f39.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/7/feba7d67-8ead-4d1f-8c4a-f404ba48838a.png?resizew=357)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a929fca455b19682d2a26ecc302123d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bf7264407abc7b2e3b2ef4baa13da06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)在(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bca9af867bfe68a7f4ff18dc9b6bdce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61721e8cd69f0492104030a2d1ad222e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fd5b3370a91450e325c0db7d53dde33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】已知,如图,在Rt△ABC中,∠C=90°,∠A=60°,AC=3,点D为AB的中点,点E为线段BC上的点,连接DE,把△BDE沿着DE翻折得△B1DE.
(1)当A、D、B1、C构成的四边形为平行四边形,求DE的长;
(2)当DB1⊥AC时,求△DE B1和△ABC重叠部分的面积.
![](https://img.xkw.com/dksih/QBM/2018/6/26/1975668899061760/1979398642892800/STEM/62aced7107de4a198df4c02215f57ea8.png?resizew=228)
![](https://img.xkw.com/dksih/QBM/2018/6/26/1975668899061760/1979398642892800/STEM/b67b73edf0ce499181dd40f6f10cc685.png?resizew=228)
![](https://img.xkw.com/dksih/QBM/2018/6/26/1975668899061760/1979398642892800/STEM/b67b73edf0ce499181dd40f6f10cc685.png?resizew=228)
(1)当A、D、B1、C构成的四边形为平行四边形,求DE的长;
(2)当DB1⊥AC时,求△DE B1和△ABC重叠部分的面积.
![](https://img.xkw.com/dksih/QBM/2018/6/26/1975668899061760/1979398642892800/STEM/62aced7107de4a198df4c02215f57ea8.png?resizew=228)
![](https://img.xkw.com/dksih/QBM/2018/6/26/1975668899061760/1979398642892800/STEM/b67b73edf0ce499181dd40f6f10cc685.png?resizew=228)
![](https://img.xkw.com/dksih/QBM/2018/6/26/1975668899061760/1979398642892800/STEM/b67b73edf0ce499181dd40f6f10cc685.png?resizew=228)
![](https://img.xkw.com/dksih/QBM/2018/6/26/1975668899061760/1979398642892800/STEM/b67b73edf0ce499181dd40f6f10cc685.png?resizew=228)
您最近一年使用:0次