如图,等腰梯形
中,
,动点P从点C出发沿
方向向点D运动,动点Q同时以相同速度从点D出发沿
方向向终点A运动,其中一个动点到达端点时,另一个动点也随之停止运动.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/cee6892a-6b94-47b8-a971-a36ce11c313a.png?resizew=215)
(1)求
的长;
(2)设
,问当x为何值时
的面积达到最大,并求出最大值;
(3)探究:在
边上是否存在点M使得四边形
是菱形?若存在,请找出点M,并求出
的长;不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f29b9d83ed8b1162dd95c48e04215c23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/28/cee6892a-6b94-47b8-a971-a36ce11c313a.png?resizew=215)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75369931b4a665aa92fba4a28136a8da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a138fefcb02cc063b48967c0fc9d28f8.png)
(3)探究:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c058444d201a33b8b0d57348c7a6be79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
更新时间:2024-01-28 11:52:05
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】抛物线
过
,
两点,与y轴相交于点C,点C、D关于抛物线的对称轴对称.
(1)求抛物线的解析式及D点坐标;
(2)在直线
下方的抛物线上存在点P,使
的面积最大,求出最大面积;
(3)当
时,函数
的最小值为5,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0929421a6188c3122442866b0b85a5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08ef03f452410ab19c6246567c427178.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/8/fb42412d-bb86-4cfb-bc3b-43d0891ac413.png?resizew=148)
(1)求抛物线的解析式及D点坐标;
(2)在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348771857779c9db5f85996a891111cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e59da5115d0dafea24822245f92c48.png)
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解题方法
【推荐2】在平面直角坐标系中,抛物线y=x2﹣2mx+1(m为常数)的图象与y轴交于点A.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/0016cd76-f403-46b3-9a59-a6b87c9aefa4.png?resizew=188)
(1)求点A的坐标.
(2)当此抛物线的顶点恰好落在x轴的负半轴时,求此抛物线所对应的二次函数的表达式,并写出函数值y随x的增大而增大时x的取值范围.
(3)当x
m时,若函数y=x2﹣2mx+1(m为常数)的最小值
,求m的值.
(4)已知Rt△EFG三个顶点的坐标分别为E(m,m)、F(0,m),G(m,m﹣10).若|m|<10,设抛物线y=x2﹣2mx+1(m为常数)与△EFG的较短的直角边的交点为P,过点P作x轴的平行线,与抛物线的另一个交点为Q,过点A作x轴的平行线,与抛物线的另一个交点为B.若AB=2PQ,直接写出m的值,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/22/0016cd76-f403-46b3-9a59-a6b87c9aefa4.png?resizew=188)
(1)求点A的坐标.
(2)当此抛物线的顶点恰好落在x轴的负半轴时,求此抛物线所对应的二次函数的表达式,并写出函数值y随x的增大而增大时x的取值范围.
(3)当x
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32a4c060d326939028f5bf77407cdba8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(4)已知Rt△EFG三个顶点的坐标分别为E(m,m)、F(0,m),G(m,m﹣10).若|m|<10,设抛物线y=x2﹣2mx+1(m为常数)与△EFG的较短的直角边的交点为P,过点P作x轴的平行线,与抛物线的另一个交点为Q,过点A作x轴的平行线,与抛物线的另一个交点为B.若AB=2PQ,直接写出m的值,
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解答题-证明题
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较难
(0.4)
【推荐1】在
中,
为
的平分线,E为边
的中点,线段
绕点E逆时针旋转得到线段
(点F是点A的对应点),旋转角不超过
,连接
,直线
交直线
于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/b01d082e-db8a-46c5-bfb3-5b91e8a0a9ec.png?resizew=609)
(1)如图1,当
为边长为a的等边三角形且点G恰好与点B重合时,求
的长;
(2)如图2,点G在边
上,
与
交于点D,
,
,求证:
;
(3)如图3,若
,过点C作
直线
于点M,连接
,当
时,按要求画图并探究
与
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/b01d082e-db8a-46c5-bfb3-5b91e8a0a9ec.png?resizew=609)
(1)如图1,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0e57a13c665af88f326c9890072bf73.png)
(2)如图2,点G在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90c3e1ce324fc3e667d8a563a0b3bfff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1480b1b81776eeb668954ded9ca4ade3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/018149b32cc8c52218139d2a888647f6.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d18c6145eb720dbba74b99fa163b180.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34cf61780928291d51c7bbb08a5fcf81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c354733af11929b1b03f68b62fed1b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b400a6c61254b81d4ccc5a2a7cf4c967.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】综合与实践:
操作体验:数学活动《折纸与证明》中,有这样一段活动材料:
对折后再展开,折痕为
;
②如图1-②,将点A翻折到
上的点
处,且使折痕过点B;
③如图1-③,沿
折叠,得
(如图1-④).
(1)根据以上操作,试证明
是等边三角形;
初步探究:
(2)某活动小组发现另一种折等边三角形的方法:如图2,点N在边
上,翻折
,使得点B落在折痕
上的点H处,连接
,则
是等边三角形,若
;
①求
的长;
②连接
并延长交
的延长线于点M,
交
于点G,如图3,求
的长;
深入探究:
(3)另一活动小组将
沿
翻折到
位置,延长
交
于点Q,如图4,求证:点Q是
的三等分点.
操作体验:数学活动《折纸与证明》中,有这样一段活动材料:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
②如图1-②,将点A翻折到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
③如图1-③,沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2df93bd15f25096c510b589aad0dfc1.png)
(1)根据以上操作,试证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2df93bd15f25096c510b589aad0dfc1.png)
初步探究:
(2)某活动小组发现另一种折等边三角形的方法:如图2,点N在边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e817a54942ebf021a2967ff0c51a8111.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5cbeac5798a155ac8649f1236fe451d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67c015d99f2677951bdcd0447240ef93.png)
深入探究:
(3)另一活动小组将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解答题-证明题
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较难
(0.4)
【推荐1】[问题情境]
如图1,小华将矩形纸片ABCD先沿对角线BD折叠,展开后再折叠,使点B落在射线
上,点
的对应点记为
,折痕与边
分别交于点
.
【特例感知】
(1)如图2,连接
,当点
与点
重合时,判断四边形
的形状,并说明理由;
【问题解决】
(2)如图3,当点
在线段
上时,连接
,设
与
分别交于点
,当
时,求证:
;
【深入探究】
(3)将(2)中的点
改为“在射线
上时”,(2)中其它条件不变的情形下,若
,
时,请直接 写出
的长.
如图1,小华将矩形纸片ABCD先沿对角线BD折叠,展开后再折叠,使点B落在射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d93949d8a15aca4e79cedb978590571.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
【特例感知】
(1)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
【问题解决】
(2)如图3,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1fa63411b334ce13037ac0e81166e5b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2db36b4497b911bc047253b832ae01c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde654b8bf0fb3f49acb19a8f4a1e48f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/499c04aaca58c36c36430c2028103552.png)
【深入探究】
(3)将(2)中的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fbc2025077fbc6922067afc766e1b9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3772b40d508c907805997426c0623fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/7aaf0dfc-2d53-40c8-8c86-bc4f2b753f6a.png?resizew=548)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐2】已知:如图,
是
的直径,
为
上一点,过
作
,
为弧
上一动点,连接
、
、
,
交
与
.
为
中点时,求证以
、
、
、
为顶点的四边形是菱形.
(2)当
时,设
的长为
,
,求
与
的关系式.
(3)在(2)的条件下,
,
,
,自然数
、
满足以下关系,
,
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279563c3c055777ce1aa369a2ef54aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e0a8cfb3747c454e0698e12857ffae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279563c3c055777ce1aa369a2ef54aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7faa0ff94133c3a93355c4a431cfa1c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/279563c3c055777ce1aa369a2ef54aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ef34a95bb58c5676d57e1db23f64ea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24c747ce8ce2440a2dbe5064f6768285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)在(2)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dddc4b7a69b59e21da7f1546c2e9d716.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c06110e9cf621c0d3e8b3987c921e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6d5b08893acc2fd6f7336198c46a79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71cbe3cea00e2e1b5b2283c7626ffc93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ea9add2aafee4840b8c80f44cc9ba9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46701afae488d1aa79f63fe981ac16f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-问答题
|
较难
(0.4)
【推荐1】问题提出
(1)如图1,在Rt△ABC中,∠ACB=90°,AC>BC,∠ACB的平分线交AB于点D.过点D分别作DE⊥AC,DF⊥BC.垂足分别为E,F,则图1中与线段CE相等的线段是 .
问题探究
(2)如图2,AB是半圆O的直径,AB=8.P是
上一点,且
,连接AP,BP.∠APB的平分线交AB于点C,过点C分别作CE⊥AP,CF⊥BP,垂足分别为E,F,求线段CF的长.
问题解决
(3)如图3,是某公园内“少儿活动中心”的设计示意图.已知⊙O的直径AB=70m,点C在⊙O上,且CA=CB.P为AB上一点,连接CP并延长,交⊙O于点D.连接AD,BD.过点P分别作PE⊥AD,PF⊥BD,重足分别为E,F.按设计要求,四边形PEDF内部为室内活动区,阴影部分是户外活动区,圆内其余部分为绿化区.设AP的长为x(m),阴影部分的面积为y(m2).
①求y与x之间的函数关系式;
②按照“少儿活动中心”的设计要求,发现当AP的长度为30m时,整体布局比较合理.试求当AP=30m时.室内活动区(四边形PEDF)的面积.
(1)如图1,在Rt△ABC中,∠ACB=90°,AC>BC,∠ACB的平分线交AB于点D.过点D分别作DE⊥AC,DF⊥BC.垂足分别为E,F,则图1中与线段CE相等的线段是 .
问题探究
(2)如图2,AB是半圆O的直径,AB=8.P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f252c1873331b0cd8a0804ee7e1f9fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52b3a717e6c8a59e5b521038a3145ad4.png)
问题解决
(3)如图3,是某公园内“少儿活动中心”的设计示意图.已知⊙O的直径AB=70m,点C在⊙O上,且CA=CB.P为AB上一点,连接CP并延长,交⊙O于点D.连接AD,BD.过点P分别作PE⊥AD,PF⊥BD,重足分别为E,F.按设计要求,四边形PEDF内部为室内活动区,阴影部分是户外活动区,圆内其余部分为绿化区.设AP的长为x(m),阴影部分的面积为y(m2).
①求y与x之间的函数关系式;
②按照“少儿活动中心”的设计要求,发现当AP的长度为30m时,整体布局比较合理.试求当AP=30m时.室内活动区(四边形PEDF)的面积.
![](https://img.xkw.com/dksih/QBM/2020/7/24/2512555437178880/2512745133342720/STEM/7635ac4a-14ef-4cc1-87ab-5845e3363411.png?resizew=447)
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,已知
中,
,
,点D是
上一点.
,
,求
的长.
(2)如图2,将
绕点D顺时针旋转
后得到线段
,
交
于点M.连接
并延长交
延长线于点F.求证:
.
(3)如图3,
,将
沿
翻折,得到
,点D、N分别是
和
上的两个动点,在运动过程中,始终保持
,过点A作直线
的垂线,垂足为G.连接
,在线段
上取一点Q,使得
,直接写出当
取得最小值时
的面积.
![](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/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d768ffd5bf75080e8ff5ce6b472c0cc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3abbaa130997ad1bed362edb6c2eaef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](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/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/770551cef0ebf3c1d369e51277a75e15.png)
(3)如图3,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efbb765b964c02c78aef348ad85b71f0.png)
![](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/d2df93bd15f25096c510b589aad0dfc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eb97aff0960e2640314888a38e7169c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2dd5f48f134d823e765523da8674aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5457adc9a5897ef66a502400d3e8fe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a74150f253eba09aef2cd96c2199dfc.png)
您最近一年使用:0次