如图,在四边形ABCD中,AB⊥AD,
=
,对角线AC与BD交于点O,AC=10,∠ABD=∠ACB,点E在CB延长线上,且AE=AC.
(1)求证:△AEB∽△BCO;
(2)当AE∥BD时,求AO的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d27f3bee10f729b6fd11f91dda5bb43e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
(1)求证:△AEB∽△BCO;
(2)当AE∥BD时,求AO的长.
![](https://img.xkw.com/dksih/QBM/2020/3/1/2409970561400832/2410240264314880/STEM/4e03077a9ee246e98aacf4dc7578589e.png?resizew=201)
更新时间:2020-03-01 17:09:16
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解答题-问答题
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名校
【推荐1】如图,
中,
,
,
是
边上的中线,且
,
(1)求
的度数.
(2)若
,则
(直接写出答案)
![](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/0fffa3d9c32da53b0ea0c338012ea20c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a55b6ce55e67f6e95e616eaf1ca3f6f8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/6/4bd77c76-503b-457b-a187-b5c52fb180d2.png?resizew=188)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23dc2d2dd56fcc67698c45a6e0e48f80.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634d6f7a95c2c1484be3324e5a53953c.png)
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解答题-证明题
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适中
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【推荐2】如图,在
中,
,点
是
上一点,以
为半径,
与
相交于点
,与
相切于点
,连结
.
(1)求证:
平分
;
(2)已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1975070c24ab281f23cd02fa360ef892.png)
,
,求
的半径
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/20/67215087-e9d1-430f-a75e-de629a7201ff.png?resizew=210)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1975070c24ab281f23cd02fa360ef892.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
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解答题-证明题
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【推荐1】阅读与思考
请阅读下列材料,并完成相应的任务.
人们在研究圆与直线的位置和数量关系时,发现存在这样一个关系:从圆外一点引圆的切线和割线,切线长是这点到割线与圆交点构成的两条线段长的比例中项.这个几何关系也叫圆的切割线定理.喜欢探究的小明尝试给出了该定理的如下证明:
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982733624942592/2985735613595648/STEM/9b70af76-e653-4241-8be2-5508a1dc689a.png?resizew=188)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982733624942592/2985735613595648/STEM/9e08f932-8eec-487e-8bab-e7d1b1aeb6e4.png?resizew=181)
已知:如图1,P为⊙O外一点,切线PA与圆相切于点A,割线PBC与圆相交于点B,C.
求证:
.
证明:如图2,连接AB,AC,BO,AO.
∵PA切⊙O于点A,∴
,即
.
∵
,∴
.
∵
,∴
.
……
任务:
(1)请帮助小明补充完成以上证明过程.
(2)如图,割线PDE与圆交于点D,E,且
,
,连接BE,过点C向下作
交PE的延长线于点F,求EF的长.
请阅读下列材料,并完成相应的任务.
人们在研究圆与直线的位置和数量关系时,发现存在这样一个关系:从圆外一点引圆的切线和割线,切线长是这点到割线与圆交点构成的两条线段长的比例中项.这个几何关系也叫圆的切割线定理.喜欢探究的小明尝试给出了该定理的如下证明:
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982733624942592/2985735613595648/STEM/9b70af76-e653-4241-8be2-5508a1dc689a.png?resizew=188)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982733624942592/2985735613595648/STEM/9e08f932-8eec-487e-8bab-e7d1b1aeb6e4.png?resizew=181)
已知:如图1,P为⊙O外一点,切线PA与圆相切于点A,割线PBC与圆相交于点B,C.
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83928a51f685c313634dba46c4fc7e2.png)
证明:如图2,连接AB,AC,BO,AO.
∵PA切⊙O于点A,∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5300b43a90a4f50a7f55a5d1caa2c68d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92d2b0cce01033ee388f4c58401fb151.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b55366721a178cdf3b5c3a7434456d90.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f92d06e858bd24924030dcdd05c80e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca81ef66b696f798c976bbf7738ec0a1.png)
……
任务:
(1)请帮助小明补充完成以上证明过程.
(2)如图,割线PDE与圆交于点D,E,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a120a6e24d8fe8a732940715a22a7a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/682c9d9b6ad1bc45ddbd6dd01060207b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d5e4889eecada5e0469c7834ee06ea.png)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2982733624942592/2985735613595648/STEM/3a7d6104-dfda-4602-bbc3-d5e98a36f410.png?resizew=187)
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【推荐2】如图1是一种自卸货车,图2是该货车的示意图,货箱侧面是一个矩形,长
米,宽
米,初始时点A、B、F在同一水平线上,车厢底部AB离地面的高度为1.3米.卸货时货箱在千斤顶的作用下绕着点A旋转,箱体底部AB形成不同角度的斜坡.
(2)点A处的转轴与后车轮转轴(点E处)的水平距离叫做安全轴距,已知该车的安全轴距为0.7m.货厢对角线AC、BD的交点G是货厢侧面的重心,卸货时如果A、G两点的水平距离小于安全轴距时,会发生车辆倾覆安全事故.当斜坡AB的坡角为45°时,根据上述车辆设计技术参数,该货车会发生车辆倾覆安全事故吗?试说明你的理由.(精确到0.1米,参考值:
,
,
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
(2)点A处的转轴与后车轮转轴(点E处)的水平距离叫做安全轴距,已知该车的安全轴距为0.7m.货厢对角线AC、BD的交点G是货厢侧面的重心,卸货时如果A、G两点的水平距离小于安全轴距时,会发生车辆倾覆安全事故.当斜坡AB的坡角为45°时,根据上述车辆设计技术参数,该货车会发生车辆倾覆安全事故吗?试说明你的理由.(精确到0.1米,参考值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0494dafbea4df1d95c758ddb656afa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78bccacbdde830e1329412e3e8f42ea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d0062f4f00732a0cf11d1ac145c218b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6eb6826dcc8bf38391aa3670447e02d.png)
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(0.65)
【推荐1】如图,抛物线y=x2+bx+c与x轴交于A(1,0),B两点,与y轴交于点C(0,3).
![](https://img.xkw.com/dksih/QBM/2022/3/7/2931094789816320/2951410304516096/STEM/f75ac258a5624a8aa6ddb3b379ff419b.png?resizew=179)
(1)求该抛物线的表达式;
(2)过点B作x轴的垂线,在该垂线上取一点P,使得△PBC与△ABC相似,请求出点P的坐标.
![](https://img.xkw.com/dksih/QBM/2022/3/7/2931094789816320/2951410304516096/STEM/f75ac258a5624a8aa6ddb3b379ff419b.png?resizew=179)
(1)求该抛物线的表达式;
(2)过点B作x轴的垂线,在该垂线上取一点P,使得△PBC与△ABC相似,请求出点P的坐标.
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解答题-应用题
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【推荐2】如图1,某小组通过实验探究凸透镜成像的规律,他们依次在光具座上垂直放置发光物箭头、凸透镜和光屏,并调整到合适的高度.如图2,主光轴l垂直于凸透镜
,且经过凸透镜光心O,将长度为8厘米的发光物箭头
进行移动,使物距
为32厘米,光线
传播方向不变,移动光屏,直到光屏上呈现一个清晰的像
,此时测得像距
为
厘米.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/7572f601-cd09-4250-8ee5-64ce41cbf0e6.png?resizew=514)
(1)求像
的长度.
(2)已知光线
平行于主光轴l,经过凸透镜
折射后通过焦点F,求凸透镜焦距
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6967ebd791092c62b4ef97924d91883.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3d30346c8a4be12f04ece8310448963.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96da6a92696231d36b502167ca0541e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c042ff18466e8165fadf343d142a4b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba463b7220be8dba3b20ac50ac6cbd37.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/18/7572f601-cd09-4250-8ee5-64ce41cbf0e6.png?resizew=514)
(1)求像
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96da6a92696231d36b502167ca0541e3.png)
(2)已知光线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80672dda9430cb42b3136bcb1b67bbad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c406c4f1880daebcccf913ba3f93512.png)
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