如图,抛物线y=ax2+bx-a+b(a,b为常数)与x轴交于A,B两点,与y轴交于点C直线BC的解析式为y=-
x+4,抛物线的对称轴交x轴于点D,M是直线BC上方抛物线对称轴上的一个动点.
(1)求该抛物线的解析式;
(2)是否存在点M,使∠BMC=90°?若存在,请求出点M的坐标;若不存在,请说明理由;
(3)Q为抛物线对称轴上一点,在坐标平面内是否存在点N,使以B,C,Q,N为顶点的四边形是矩形?若存在,请直接写出点N的坐标;职若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
(1)求该抛物线的解析式;
(2)是否存在点M,使∠BMC=90°?若存在,请求出点M的坐标;若不存在,请说明理由;
(3)Q为抛物线对称轴上一点,在坐标平面内是否存在点N,使以B,C,Q,N为顶点的四边形是矩形?若存在,请直接写出点N的坐标;职若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500110265040896/2501672745164800/STEM/b8ab7602-126d-415a-9df7-1eb017ca449b.png)
更新时间:2020-07-08 21:29:08
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】如图,抛物线
(
)与x轴相交于
,
,与y轴交于点
.
![](https://img.xkw.com/dksih/QBM/2022/12/1/3121652151640064/3129859074555904/STEM/e25c4be048d040e9857926450ff2ab2e.png?resizew=178)
(1)求抛物线的表达式;
(2)设点D是抛物线的对称轴上的一点,在抛物线上是否存在点Q,使以点B,C,D,Q为顶点的四边形为平行四边形?若存在,求出点Q的坐标;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a90385c676848de67293e3ed6bc000fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20849c00c47cbdc43f18d53341b6c4e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d03fa28c117649b0fdfe17eed7b583.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62855ff21228ecea8e28fd0fbeb814ee.png)
![](https://img.xkw.com/dksih/QBM/2022/12/1/3121652151640064/3129859074555904/STEM/e25c4be048d040e9857926450ff2ab2e.png?resizew=178)
(1)求抛物线的表达式;
(2)设点D是抛物线的对称轴上的一点,在抛物线上是否存在点Q,使以点B,C,D,Q为顶点的四边形为平行四边形?若存在,求出点Q的坐标;若不存在,说明理由.
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】如图,在平面直角坐标系中,二次函数
的图像与
轴交于点
和点
,与
轴交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/86c8144f-8611-4404-8003-71b74bd0b0d5.png?resizew=369)
(1)写出这个二次函数的表达式 ;
(2)如图,点
为直线
上方抛物线上的一点,
与
交于点
,当
时,求点
的坐标;
(3)若点
是抛物线对称轴上一点,且点
的纵坐标为
,当
是锐角三角形时,
的取值范围是 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58d88bbd34102b55fa928e8ff83f0d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94817691c8b697043fb99f0900b88607.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7757e63a8e454b7800fb4112e5590d44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/31/86c8144f-8611-4404-8003-71b74bd0b0d5.png?resizew=369)
(1)写出这个二次函数的表达式 ;
(2)如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4e188051245c63976632c36b522f1a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.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/555761f72a4c0698c78ca319ed6ff0c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】如图,在平面直角坐标系中,抛物线y=
与x轴交于A(-1,0),B(4,0)两点,与y轴交于点C,点P为直线BC上方抛物线上一动点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/37360902-3049-4053-966d-12da6c03df26.png?resizew=200)
(1)求抛物线的解析式;
(2)过点A作AD//BC交抛物线于点D,点Q为直线AD上一动点,连接CP,CQ,BP,BQ,求四边形BPCQ面积的最大值及此时点P的坐标;
(3)将抛物线沿射线CB方向平移
个单位,M为平移后的抛物线的对称轴上一动点,在平面直角坐标系中是否存在点N,使以点B,C,M,N为顶点的四边形为菱形?若存在,请直接写出所有符合条件的点N的坐标,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb397c1bfbf7a745a59d2a052cd4dd14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/37360902-3049-4053-966d-12da6c03df26.png?resizew=200)
(1)求抛物线的解析式;
(2)过点A作AD//BC交抛物线于点D,点Q为直线AD上一动点,连接CP,CQ,BP,BQ,求四边形BPCQ面积的最大值及此时点P的坐标;
(3)将抛物线沿射线CB方向平移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.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1,在平面直角坐标系中,点O为坐标原点,点A的坐标为
,直线
经过点
、
.将四边形
绕点O按顺时针方向旋转α度得到四边形
,此时直线
、直线
分别与直线
相交于点P、Q.
![](https://img.xkw.com/dksih/QBM/2023/5/14/3237441995620352/3240443497684992/STEM/18df913ae92143b99c285f6a8428345a.png?resizew=550)
(1)四边形
的形状是 ,当
时,
的值是 ;
(2)①如图2,当四边形
的顶点
落在y轴正半轴上时,求
的值;
②如图3,当四边形
的顶点
落在直线
上时,求
的面积;
(3)在四边形
旋转过程中,当
时,是否存在这样的点P和点Q,使得
,若存在,请直接写出点P的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9b8e98d378f2d52c9efe4fa2609dc1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e676522d71dce42abe4e03a82d1f78b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f845a7c69953429bd6228ac76f6848ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fff1dd4920f99effb1d47fdfa24a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48fce10478485ef01d2318fc3465bb4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2023/5/14/3237441995620352/3240443497684992/STEM/18df913ae92143b99c285f6a8428345a.png?resizew=550)
(1)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33ac762a2899a58faa0d3ab44f1281fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9d64d8a012aae5af874a41385044b3.png)
(2)①如图2,当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fff1dd4920f99effb1d47fdfa24a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b9d64d8a012aae5af874a41385044b3.png)
②如图3,当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85fff1dd4920f99effb1d47fdfa24a1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ed4d3de99291a1cd77636de11fea9ef.png)
(3)在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/165654f64dcc343721d53b85cac3cf86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd35373af581134ebef9c7f838e85019.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,等边
中,
,动点
,
分别是边
,
上的两个点,且满足
,以
,
为邻边构造
,记
的长为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2939c251266f6809e515be390a3899d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/e08ae682-ff1e-438d-8077-1542af97660a.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/39626dc7-3a6a-4001-815e-35fa8b9afaab.png?resizew=453)
(1)
______(含
的代数式表示);
(2)当点
分别落在
,
的角平分线上时,求对应的
的值;
(3)作
的角平分线,交
于
,当
恰好平分
的面积时,
_____.(请直接写出答案)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6344da8eab27b4ccc60b799c5d579e0d.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/82f3e251b03268a482776aa70637ef2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2939c251266f6809e515be390a3899d1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/e08ae682-ff1e-438d-8077-1542af97660a.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/16/39626dc7-3a6a-4001-815e-35fa8b9afaab.png?resizew=453)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a71a9d21f77e9535de152bb33f802bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82f3e251b03268a482776aa70637ef2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐3】综合与实践
问题情境:
已知四边形
是正方形,点P是直角三角尺的直角顶点.
(1)如图1,将点P放在正方形
的顶点A处,三角尺的两条直角边分别与
,
的延长线交于点E,F,则
与
之间的数量关系为_______.
操作发现:
(2)如图2,将点P放在正方形
的对角线
上,三角尺的两条直角边分别与
,
的延长线交于点E,F,则(1)中的结论还成立吗?请说明理由.
拓广探索:
(3)如图3,将点P放在正方形
的边
上(不包含点B,C),三角尺的一条直角边经过点A,另一条直角边与正方形的外角
的平分线
相交于点E,试判断
与
之间的数量关系,并说明理由.
问题情境:
已知四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)如图1,将点P放在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
操作发现:
(2)如图2,将点P放在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
拓广探索:
(3)如图3,将点P放在正方形
![](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/0b5c4253bdb0cd70c706d6d1fa554218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.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,在
中,∠ACB=90°,AB=10,AC=6,点P从点B出发,以每秒5个单位长度的速度沿BC向点C运动,同时点M从点A出发,以每秒6个单位长度的速度沿AB向点B运动,过点P作PQ⊥AB于点Q,以PQ、MQ为邻边作矩形PQMN,当点P到达点C时,整个运动停止.设点P的运动时间为t(t>0)秒.
(1)求BC的长;
(2)用含t的代数式表示线段QM的长;
(3)设矩形PQMN与
重叠部分图形的面积为S(S>0),求S与t之间的函数关系式;
(4)连结QN,当QN与
的一边平行时,直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
(1)求BC的长;
(2)用含t的代数式表示线段QM的长;
(3)设矩形PQMN与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(4)连结QN,当QN与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/2021/1/8/2631789785923584/2638600863211520/STEM/4a98da6e-7adf-49b3-b09d-fbb386061449.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
【推荐2】综合与实践
动手操作:
小明同学将一大一小两个三角板
和三角板
按照如图1所示的方式摆放.其中
,
,
,点E在边
上.
问题思考:
(1)如图1,延长
交
于点F,求
的长.
问题探究:
(2)如图2,若将图1中的
绕着点B顺时针方向旋转,连接
,试探究
与
是否相似,请说明理由.
实践探究:
(3)在三角板
旋转的过程中,当点C,E,D在同一条直线上,且点E在
的上方时,请直接写出点D到直线
的距离.
动手操作:
小明同学将一大一小两个三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/152cfd5011c94e02c1a9cbbd4d8f58bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74db1f028c135803c5f56852ec330d01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/157d8b528265b39efdcf4006c6de05d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e1b72bd9dfab5b956b1cbb0ce80e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/31/1db81266-ba5c-45a5-aa17-798cae5cdd41.png?resizew=583)
问题思考:
(1)如图1,延长
![](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/4cae70b8a9d2d2e96dea62c00ced04b9.png)
问题探究:
(2)如图2,若将图1中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321370fe42bc1216902ea19fbd2a5979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/746c210ba609265447a900d104d1ef4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0c32d9f3badb7e51233dd39a39fbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
实践探究:
(3)在三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34be4e71cabf458f17a6cd7f24bc70af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
解题方法
【推荐1】如图①,以
的两边
,
分别向外作等边
和等边
,
与
交于点
,已知
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/4/19/2445021137264640/2445581193314304/STEM/4d7ac878-40c8-4017-a138-977c03a7422c.png)
(1)证明:
;
(2)求边
的长;
(3)如图②,若点
、
分别是等边
和等边
的中心,连接
、
、
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33c2aa4cb5a3b8da3b188ab6a21520c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
![](https://img.xkw.com/dksih/QBM/2020/4/19/2445021137264640/2445581193314304/STEM/4d7ac878-40c8-4017-a138-977c03a7422c.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6258f1e2abf8d1eb7b158a140475744c.png)
(2)求边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)如图②,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db5e1441a49e782ff0ef46e776cde06a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33c2aa4cb5a3b8da3b188ab6a21520c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6da2235c42867f9a79007c3fc83fec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7b816eca15d4b7d060013df53edd53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d7b816eca15d4b7d060013df53edd53.png)
您最近一年使用:0次
解答题-问答题
|
较难
(0.4)
名校
【推荐2】如图,长方形ABCD绕点C旋转到长方形CEFG处,点B的对应点E落在AD边上,
![](https://img.xkw.com/dksih/QBM/2021/11/8/2847104426917888/2927756064243712/STEM/da90699f-1f7f-4006-92ba-8dbf6bb07302.png?resizew=440)
(1)若
,
,如图(1),连接DF.
①求DE的长;
②求
的面积.
(2)若
,
,如图(2),连接BG,BG交EC于点H,连接DH,求
的面积.
![](https://img.xkw.com/dksih/QBM/2021/11/8/2847104426917888/2927756064243712/STEM/da90699f-1f7f-4006-92ba-8dbf6bb07302.png?resizew=440)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ebb33adb2310a6e03918761e68204a.png)
①求DE的长;
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30b0393ce62b24aa5f9b740d4cc6743b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b238947afe06e2fb5f2a98bde3bd0f01.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐3】如图1,我们已经学过:点C将线段AB分成两部分,如果
,那么称点C为线段AB的黄金分割点.某校的数学拓展性课程班,在进行知识拓展时,张老师由黄金分割点拓展到“黄金分割线”,类似地给出“黄金分割线”的定义:直线l将一个面积为S的图形分成两部分,这两部分的面积分别为S1,S2,如果
,那么称直线l为该图形的黄金分割线.
如图2,在△ABC中,∠A=36°,AB=AC,∠C的平分线交AB于点D.
(1)证明点D是AB边上的黄金分割点;
(2)证明直线CD是△ABC的黄金分割线.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a7faac3b36166087bf5cccd0a245ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c957ce70295147eb9ecf2ccae4597b8.png)
如图2,在△ABC中,∠A=36°,AB=AC,∠C的平分线交AB于点D.
(1)证明点D是AB边上的黄金分割点;
(2)证明直线CD是△ABC的黄金分割线.
![](https://img.xkw.com/dksih/QBM/2018/12/5/2090389059174400/2094548247027712/STEM/577b7c6a1314415aafd5548dd794d674.png?resizew=307)
您最近一年使用:0次