题型:解答题-证明题
难度:0.15
引用次数:328
题号:9385525
如图,在
与
中,
,
,
,
,
,射线
与直线
交于点P.
(1)求证:
;
(2)若
,求
的值;
(3)若
绕点B逆时针旋转一周,直接写出线段
的最大值与最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c2e70f28845c57f004b64f6fe46573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a7ce2e389c0db029894b28c47225c34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21dfbbcd5a6357b9fadc47e37a7059a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af633abfe3cb03f1836db6c570a5bcc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/4/dc379de6-f84f-4627-80b5-c69c846d8c61.png?resizew=223)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81ad7dc509eed52bfd0cdd1ec3981226.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3a9cdc8aae01c982eb8939a605e5004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07d740f8dc9056f60a9b73d1b22fdb7.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69c2e70f28845c57f004b64f6fe46573.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
更新时间:2020-01-16 16:35:02
|
【知识点】 相似三角形的判定与性质综合
相似题推荐
解答题-问答题
|
困难
(0.15)
【推荐1】如图,△ABC的三个顶点坐标分别为
,
,
,抛物线
经过
的三个顶点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/b2e66255-a74f-4666-9039-5fc4a62638e7.png?resizew=440)
(1)求抛物线
的函数表达式;
(2)点M是抛物线在第一象限上一点.
①连接
与
相交于点E,即将
分为两个三角形,若这两个三角形的面积之比为
时,则点M的坐标为_______,直线
的函数表达式为_______;
②将
沿着x轴正方向平移,当点B与点M重合时停止,点A的对应点为
,点O的对应点为点
,求出
与
重合部分的图形的周长;
(3)在抛物线
的对称轴上取一点K,连接
,使
,延长
交抛物线于点P,连接
,动点Q从C点出发,沿射线
以每秒1个单位长度的速度运动,是否存在某一时刻,使
?若存在,请直接写出此时t的值;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66b8c639c851e0044ee22020324c5570.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0709c9ca5c529800d46ebe9b1ab3beb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9263027f810ff33bc70aa6379356d2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/4/b2e66255-a74f-4666-9039-5fc4a62638e7.png?resizew=440)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
(2)点M是抛物线在第一象限上一点.
①连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a7ef20e925954f796cc9af744e4a38f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
②将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2b83beedb3438153e6f728545fe3e03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b097b8f5dee99ec3d1a01eef5bf955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
(3)在抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8352b2e643a7ce605334f1b0e572bfb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1bd75fbe8bec72e27a3b3b6d48f138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573cc61cd7b846beeb2d223367c9bddd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b1bd75fbe8bec72e27a3b3b6d48f138.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4c6b0869d7248b6c2f964718a67702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0dd01eaf1d1b46a8a804d4e2643a2b.png)
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解答题-问答题
|
困难
(0.15)
名校
【推荐2】已知抛物线
与x轴交于A、B两点(点A在点B的左侧),与y轴交于点
,点M是线段
上一动点,连接
.
![](https://img.xkw.com/dksih/QBM/2022/12/26/3139037119569920/3141181883260928/STEM/76528299c44d48648c67b2c84cdf22fd.png?resizew=472)
(1)点A坐标是______;点B坐标是______;抛物线的函数表达式是______;
(2)当
时,则
的值是______;
(3)如图2,过点M作x轴的垂线,交抛物线于点E.
①当
______时,四边形
的面积最大?此时四边形
的最大面积是______;
②如图3,在①的条件下,将
右侧的抛物线沿
对折,交y轴于点F,请直接写出点F的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0a689a0bea86ac5512d89d2fb8f73d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c052d7af2f98d95bac8725b608fba0fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/2022/12/26/3139037119569920/3141181883260928/STEM/76528299c44d48648c67b2c84cdf22fd.png?resizew=472)
(1)点A坐标是______;点B坐标是______;抛物线的函数表达式是______;
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e7f01745e79b9f613398bb274b6d1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38380477b95a0fff93dbcffafe42ddf6.png)
(3)如图2,过点M作x轴的垂线,交抛物线于点E.
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b7dc2816d332f8761bfe2db1d9db87e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a876bc003f6c042c24ff4d8c11c8a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42a876bc003f6c042c24ff4d8c11c8a8.png)
②如图3,在①的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
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