如图,⊙O是以AB为直径的
的外接圆,∠ACB的平分线交⊙O于点D,延长CB至点E,使得
,连接AE.
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960704013877248/2962302544756736/STEM/ab11249bb473402eb61f2db6daa6cd84.png?resizew=161)
(1)求证:DE是⊙O的切线;
(2)若
,⊙O的直径为10,求点O到CD的距离;
(3)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e7fa7a6af291b7c23d2f1f13966156.png)
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960704013877248/2962302544756736/STEM/e172a3e6b59344189e79bd2ecb0d63be.png?resizew=166)
![](https://img.xkw.com/dksih/QBM/2022/4/18/2960704013877248/2962302544756736/STEM/ab11249bb473402eb61f2db6daa6cd84.png?resizew=161)
(1)求证:DE是⊙O的切线;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4494a85de0be0b97a69348115aef8513.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11366a3658d5afe6b0520b764fb0a34c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ebbb89ac9ec9860a8a3235c89a6182.png)
更新时间:2022-04-20 16:42:52
|
相似题推荐
解答题-问答题
|
困难
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【推荐1】将线段
绕点
顺时针旋转
得到线段
,再以线段
为边画等边
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/0f4e648b-6b5e-4323-a634-868b6fd0176c.jpg?resizew=373)
(1)①如图1,若
,则
的度数为___________.
②在旋转过程中,
改变,求出
的度数.
(2)如图2.在
中,
,
,
.当
时,
①求
的长.
②把图2位置中的
点看成起始点,点
随
从图2位置顺时针旋转而运动,到
与
重合时
停止旋转,同时点
也停止运动,直接写出点
的运动路径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d21b9757f1c68f9e97047126e5bddd8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f517953a21c2a45fd8465072c44bfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/20/0f4e648b-6b5e-4323-a634-868b6fd0176c.jpg?resizew=373)
(1)①如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2334ac570fefa8bcb3f48ef6da9719e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
②在旋转过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
(2)如图2.在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2e7e210f6a533028a2e6c2e5c7e019.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d10b6175fb056760a9357936d14ffe82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f46f19939f38833f9152942f8241b7c.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
②把图2位置中的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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【推荐2】如图,
为圆
的直径,弦
,垂足为
,过点
作
,垂足为
,
、
相交于点
.
(1)求证:
;
(2)过点
作
,垂足为
,
为
边中点,连接
,求证:
;
(3)在(2)的条件下,延长
交
于点
,若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a45b04cc3e5adaeff6f9e01e29032803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/55d9d426-5fea-4ea7-a61b-7370cc0c9742.png?resizew=411)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0cfd1be3e373ad8447e06afb8c9a2f1.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a52c2cef865a70d7b72386658e62efb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8e381c13279a931c536fc8b37e97417.png)
(3)在(2)的条件下,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e9a28081321c3ceaaff7a2f74d23fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56512504254ab7f574a717dd6830fb33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
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【推荐3】【问题提出】
(1)如图1,已知在边长为5的等边
中,点D在边
上,
,连接
,则
的面积为 ;
【问题探究】
(2)如图2,已知在边长为6的正方形
中,点E在边
上,点F在边
上,且
,若
,求
的面积;
【问题解决】
(3)如图3是某座城市廷康大道的一部分,因自来水抢修在
米,
米的矩形
区域内开挖一个
的工作面,其中B、F分别在
边上(不与B、C、D重合),且
,为了减少对该路段的拥堵影响,要求
面积最小,那么是否存在一个面积最小的
?若存在,请求出
面积的最小值;若不存在,请说明理由.
(1)如图1,已知在边长为5的等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
【问题探究】
(2)如图2,已知在边长为6的正方形
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192155e6a3aade305b76b1eb7c75e30c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7c422a19b68b8b4cd484d22897e3a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
【问题解决】
(3)如图3是某座城市廷康大道的一部分,因自来水抢修在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a91146605aff8a321203a5907143cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a20cb2c77ea29b6eabbc477bc3743859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a9eb456c912e01458c19b06e83a5c9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
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真题
【推荐1】如图,在直角体系中,直线AB交x轴于点A(5,0),交y轴于点B,AO是⊙M的直径,其半圆交AB于点C,且AC=3.取BO的中点D,连接CD、MD和OC.
(1)求证:CD是⊙M的切线;
(2)二次函数的图象经过点D、M、A,其对称轴上有一动点P,连接PD、PM,求△PDM的周长最小时点P的坐标;
(3)在(2)的条件下,当△PDM的周长最小时,抛物线上是否存在点Q,使S△PDM=6S△QAM?若存在,求出点Q的坐标;若不存在,请说明理由.
(1)求证:CD是⊙M的切线;
(2)二次函数的图象经过点D、M、A,其对称轴上有一动点P,连接PD、PM,求△PDM的周长最小时点P的坐标;
(3)在(2)的条件下,当△PDM的周长最小时,抛物线上是否存在点Q,使S△PDM=6S△QAM?若存在,求出点Q的坐标;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2017/5/3/1678957189234688/1684550983966720/STEM/0e909aeabfd645298f4562cd1f6d0422.png?resizew=232)
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【推荐2】如图,已知抛物线y1=ax2+c过点(﹣4,5),(1,
),直线y2=kx+2与y轴交于C点,与抛物线交于A,B两点,点B在点A的右侧.
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923363678535680/2926676360749056/STEM/915e693986694726928bfd176d9bce20.png?resizew=242)
(1)求抛物线的解析式;
(2)点P为第一象限抛物线上一个动点,以点P为圆心,PC为半径画圆,求证:x轴是⊙P的切线;
(3)我们规定:当x取任意一个值时,x对应的函数值分别为y1和y2,若y1≠y2,取y1和y2中较大者为M;若y1=y2,记M=y1=y2.
①k=2时,求使M>y2的x的取值范围;
②当k=﹣1时,求使M=5的x的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d59ab85c075a09d55d69e159e4abb268.png)
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923363678535680/2926676360749056/STEM/915e693986694726928bfd176d9bce20.png?resizew=242)
(1)求抛物线的解析式;
(2)点P为第一象限抛物线上一个动点,以点P为圆心,PC为半径画圆,求证:x轴是⊙P的切线;
(3)我们规定:当x取任意一个值时,x对应的函数值分别为y1和y2,若y1≠y2,取y1和y2中较大者为M;若y1=y2,记M=y1=y2.
①k=2时,求使M>y2的x的取值范围;
②当k=﹣1时,求使M=5的x的值.
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解题方法
【推荐3】如图1,在
中,
,
,
,P,Q两点同时从点A出发,点P沿折线
运动,在
边上的速度为
,在
边上的速度为
;点Q在
上作往返运动,由A到D的速度为
,返回时速度为
.点P到达点C时,两点均停止运动,当运动时间为
时,以线段
为直径作
,解决下列问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/c11429c6-656a-420b-9a38-6594fbb4a805.png?resizew=426)
(1)在
时,
与
的位置关系是__________;
(2)当点P在
上时,
与
的另一个交点为T点.
①如图2,当点P运动至点B时,求弧
的长度;
②如图3,当
时,求t的值.
(3)在点P的运动过程中(不含与点B重合的情况),直接写出t为何值时,
与
或
相切.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7cc6ebe3a443327530a2538e4013fc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/778cdfe7346279f9695a745fb780e806.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4bf2ed4e49655ce765ba6ffbb6c7d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ba95116dc790b935d65bf540799cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ba95116dc790b935d65bf540799cea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4bf2ed4e49655ce765ba6ffbb6c7d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c1a48b92c61d209d0556e4cd8fdb70b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/15/c11429c6-656a-420b-9a38-6594fbb4a805.png?resizew=426)
(1)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0255aeb7e872740911e79ac5f79eed05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)当点P在
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①如图2,当点P运动至点B时,求弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04e4b0ddfa5aec71d6df83e574b56150.png)
②如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db4c2b83064fd275a7745dc1e5743eb0.png)
(3)在点P的运动过程中(不含与点B重合的情况),直接写出t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐1】如图,
内接于
,点
在直径
的延长线上,且
,连结
,
.
是
的切线.
(2)若
的半径为
,
.
①当
时,求
.
②求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3631ef304992b6c0c592be4dd158edba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edbe289ad89a4243903108709ce0381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e932b4add3175358f15be0e1f7104e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3156b27cf1972cdeb07a7a9645e1da06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edbe289ad89a4243903108709ce0381.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edbe289ad89a4243903108709ce0381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/933093b52cca887f597cbe22a5467b11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1d3a1a16695836c1f71e09cdf642e85.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb3a32abc7eb68f812ba99ec915432fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0bdc3af98cb538b5e4e6261f8dbb43d.png)
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解答题-问答题
|
困难
(0.15)
【推荐2】已知四边形
是菱形,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/339ecafa-3189-44dd-a5aa-329c70ed2983.png?resizew=566)
(1)如图1,
是
上一点,连接
并延长,交
的延长线于点
,交
于点
,若
,
①求
的长;
②求
的长;
(2)如图2,
是
的中点,连接
,过点
作
交
的延长线于点
,点
在
上,连接
,分别过点
作直线
的垂线,垂足分别为
,若
,求
的长;
(3)如图3,
为
上一点,
为
上一点,
,分别过点
作
的平行线,两条直线交于点
,将四边形
绕点
顺时针旋转,如图4,直线
交直线
于点
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b3c46cd580717afaf81c9278ee73be.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/14/339ecafa-3189-44dd-a5aa-329c70ed2983.png?resizew=566)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adaead91b4b6febfcdd6f995d81e550.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
②求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
(2)如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8096b3edbcf010b6226a227351c1b586.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be9cf954cfee5199ecd6fec55a269d57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2dca049735b45fb9b2533c68605eddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280012712502023488a4cf062a8eab09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ee3e567700c1d5b17944ffc6229c78.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67716ac738ee2911a69bf4063110a5bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/288212638a7cd21ccf1824f1e4231742.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96040b162c12cd168f7782ac2e35d2c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd6877751384616819a8ddeef96c4133.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f02fcd70bddad9955d6cc04ac0bf9bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f78442aba4de44c5d4759fb23e294fc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83ebffbdca89cc68c33706ab069fc6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f0483b36e635f5daf51ed2074b4b4ff.png)
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解答题-问答题
|
困难
(0.15)
【推荐1】如图,已知抛物线
:
交
轴于点
,交
轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/19/9de452af-4a42-4f7b-a733-55eb285f22b9.png?resizew=174)
(1)直接写出点
的坐标;
(2)将直线
向下平移
个单位,使直线
与抛物线恰好只有一个公共点,求
的值;
(3)在抛物线上存在点
,使
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafd176dd446874b03183efc4f16ddde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.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/2023/3/19/9de452af-4a42-4f7b-a733-55eb285f22b9.png?resizew=174)
(1)直接写出点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
(2)将直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)在抛物线上存在点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/884b5685834b5adc8bed14a67111e493.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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名校
【推荐2】【定义】
例如,如图1,过点A作
交
于点B,线段
的长度称为点A到
的垂直距离,过A作
平行于y轴交
于点C,
的长就是点A到
的竖直距离.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/e82661c0-999c-4bcf-9a42-8a2f068fea47.png?resizew=482)
【探索】
当
与x轴平行时,
,
当
与x轴不平行,且直线确定的时候,点到直线的垂直距离
与点到直线的竖直距离
存在一定的数量关系,当直线
为
时,
___________
.
【应用】
如图2所示,公园有一斜坡草坪,其倾斜角为
,该斜坡上有一棵小树(垂直于水平面),树高
,现给该草坪洒水,已知小树的底端点A与喷水口点O的距
,建立如图2所示的平面直角坐标系,在喷水过程中,水运行的路线是抛物线
,且恰好经过小树的顶端点B,最远处落在草坪的C处,
(1)
___________.
(2)如图3,现决定在山上种另一棵树
(垂直于水平面),树的最高点不能超过喷水路线,为了加固树,沿斜坡垂直的方向加一根支架
,求出
的最大值.
【拓展】
(3)如图4,原有斜坡不变,通过改造喷水枪,使得喷出的水的路径近似可以看成圆弧,此时,圆弧与y轴相切于点O,若此时
m,如图,种植一棵树
(垂直于水平面),为了保证灌溉,请求出
最高应为多少?
例如,如图1,过点A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3939688369b6386452946f33c740bbb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/e82661c0-999c-4bcf-9a42-8a2f068fea47.png?resizew=482)
【探索】
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab41054fa9ce51b68e78d9c0cf398d9.png)
当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd8f64ebec4a71a609204458cc54df82.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/dd8f64ebec4a71a609204458cc54df82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e091cface0c4a22727634eb480562d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9941b969048c0478a9d4116bfe4c6c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
【应用】
如图2所示,公园有一斜坡草坪,其倾斜角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c030b25575d683af91c06e6a3e4f463.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386f5889ae7aa13ad09b3cdb4f7f89ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54749779d31eb435800871934461a2d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40d7213717e25a37cc634c2ce0a3563c.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef1dbed0813c67a81a3a76c288a3f105.png)
(2)如图3,现决定在山上种另一棵树
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1b418d67b301ebfd7db583aa176e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1b418d67b301ebfd7db583aa176e28.png)
【拓展】
(3)如图4,原有斜坡不变,通过改造喷水枪,使得喷出的水的路径近似可以看成圆弧,此时,圆弧与y轴相切于点O,若此时
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/974fbe4546b3c5d04ed551f6debb9d53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
您最近一年使用:0次
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|
困难
(0.15)
名校
解题方法
【推荐3】我们不妨约定:对角线互相垂直的凸四边形叫做“十字形”.
(1)①在平行四边形,矩形,菱形、正方形中,一定是十字形的有 ;
②若凸四边形ABCD是十字形,AC=a,BD=b,则该四边形的面积为 ;
(2)如图1,以等腰Rt△ABC的底边AC为边作等边三角形△ACD,连接BD,交AC于点O, 当
≤S 四边形≤
时,求BD的取值范围;
(3)如图2,以十字形ABCD的对角线AC与BD为坐标轴,建立如图所示的平面直角坐标系xOy,若计 十字形ABCD的面积为S,记△AOB,△COD,△AOD,△BOC的面积分别为:S1,S2,S3,S4,且同时满足列四个条件:
![](https://img.xkw.com/dksih/QBM/2020/6/1/2475353984753664/2475964511739904/STEM/40d064ce51bc47c7a9aaed81aa2dd12e.png?resizew=310)
①
;②
;③十字形ABCD的周长为32:④∠ABC=60°; 若E为OA的中点,F为线段BO上一动点,连接EF,动点P从点E出发,以1cm/s 的速度沿线段EF匀速运动到点F,再以2cms 的速度沿线段FB匀速运动到点B,到达点B 后停止运动,当点P沿上述路线运动 到点B所需要的时间最短时,求点P走完全程所需的时间及直线EF的解析式.
(1)①在平行四边形,矩形,菱形、正方形中,一定是十字形的有 ;
②若凸四边形ABCD是十字形,AC=a,BD=b,则该四边形的面积为 ;
(2)如图1,以等腰Rt△ABC的底边AC为边作等边三角形△ACD,连接BD,交AC于点O, 当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f78ad1dc62b060930bdb5d43d0c47ef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30668eaf40f2143ee2d93408c870d617.png)
(3)如图2,以十字形ABCD的对角线AC与BD为坐标轴,建立如图所示的平面直角坐标系xOy,若计 十字形ABCD的面积为S,记△AOB,△COD,△AOD,△BOC的面积分别为:S1,S2,S3,S4,且同时满足列四个条件:
![](https://img.xkw.com/dksih/QBM/2020/6/1/2475353984753664/2475964511739904/STEM/40d064ce51bc47c7a9aaed81aa2dd12e.png?resizew=310)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2928c9b357554a9436fe7bb6f7f9d0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13552072bb404bbb608a40f48bdaf2b0.png)
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