1 . 如图,在等腰
中,
,
,
是
边上的中点,点
、
分别在
、
边上运动,且保持
,连接
、
、
,在此运动过程中,下列结论:①
是等腰直角三角形;②
与
不可能全等;③四边形
的面积保持不变;④
面积的最大值为18,其中正确结论的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/495d0459-addb-4b9c-b920-3d5a6c81e802.png?resizew=152)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1365ae9fece5251c36929ffedcca9224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fd09f591e95fd40e8ecfe6020f9f46.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/592849d99e570c23906687097b1072ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea2f3df5713a423887c16e6355236372.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/12/495d0459-addb-4b9c-b920-3d5a6c81e802.png?resizew=152)
A.1个 | B.2个 | C.3个 | D.4个 |
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2 . 为了响应“乡村振兴”政策的号召,某农科所下乡为村民指导大棚种植.如图展示的是一个横截面为抛物线的大棚,有关尺寸如图所示.
如图1,已知大棚横截面最高点到地面的距离为2米,两端触地点
、
相距5米.
![](https://img.xkw.com/dksih/QBM/2022/12/3/3122679273897984/3127021163446272/STEM/b71bda877ba64c16a37c033f598dac52.png?resizew=482)
(1)以点
为坐标原点,水平向右为
轴正方向,竖直向上为
轴正方向构建平面直角坐标系,求此抛物线的解析式(不需要求自变量的取值范围);
(2)一位身高
米的菜农,若要在大棚内站直行走,求此菜农在横截面内横向活动范围为多少米;
(3)如图2,为了使大棚更牢固,在此横截面内从
点起,沿地面每隔1米竖立一根钢杆连接到大棚外边缘上,则在此横截面内所有钢杆的长度和为_____米(直接写出答案即可).
如图1,已知大棚横截面最高点到地面的距离为2米,两端触地点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2022/12/3/3122679273897984/3127021163446272/STEM/b71bda877ba64c16a37c033f598dac52.png?resizew=482)
(1)以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)一位身高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/268ea741337c91ef3134d8e076828831.png)
(3)如图2,为了使大棚更牢固,在此横截面内从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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3 . 分别用定长为
的线段围成矩形、圆、等边三角形,则面积最大的图形是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
A.矩形 | B.圆 | C.等边三角形 | D.无法确定 |
您最近一年使用:0次
4 . 如图(1),已知抛物线
:
与
轴交于
,
两点(
在
的右侧),交
轴于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/46b7f2ca-f293-4861-972d-faa2cb735ea7.png?resizew=431)
(1)直接写出
的中点
的坐标;
(2)直线
(
,
为常数)过
的中点,与抛物线
:
交于
,
(
在
的右侧),若点
,
的水平距离与点
,
的水平距离相等,求
的值;
(3)如图(2),将抛物线
向右平移得到过原点的抛物线
,抛物线
的对称轴为直线
,直线
(
,
为常数,且
)与抛物线
有唯一公共点
,且与直线
交与点
,点
关于
轴的对称点为
,
于
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8cce0038e85b37ac01672aa2ccc042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/2022/12/9/46b7f2ca-f293-4861-972d-faa2cb735ea7.png?resizew=431)
(1)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15fb18163df0690365a0d2e7ee88f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e8cce0038e85b37ac01672aa2ccc042.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(3)如图(2),将抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c1972246a0a3d1c987d25205dbdd99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0baedc4d7e690ab3f7d80d30ba0a9efe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5b9d83969b6a8e27e57ab71b34e2b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3171b3d11c6f4619e189677345357508.png)
您最近一年使用:0次
5 . 如图所示,在
中,
,点
从点
出发沿边
向点
以
的速度移动,点
从
点出发沿
边向点
以
的速度移动.如果点
同时出发
秒后
的面积为
.
![](https://img.xkw.com/dksih/QBM/2022/11/27/3118565248425984/3120053610610688/STEM/4ff0073cfa6a47a2a3b0b350ef1292ee.png?resizew=112)
(1)求y与x的函数关系式,并写出x的取值范围;
(2)几秒时,△PCQ的面积为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6702bee1c15636ceae3e98fd766e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebc2d9b900111188aca83126dff97f32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5ad58997b9dc0b341c9af08f0cd1fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba70863115b0947e98214a7b2512167d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38531892b51384db3d82c21741e4110a.png)
![](https://img.xkw.com/dksih/QBM/2022/11/27/3118565248425984/3120053610610688/STEM/4ff0073cfa6a47a2a3b0b350ef1292ee.png?resizew=112)
(1)求y与x的函数关系式,并写出x的取值范围;
(2)几秒时,△PCQ的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9202af84bc055b58bd51fae5e3272283.png)
您最近一年使用:0次
6 . 抛物线
与
轴交于
、
两点.与
轴交于点
、点
在抛物线上.
![](https://img.xkw.com/dksih/QBM/2022/11/22/3114868951801856/3117927391846400/STEM/5f41b982a387409ca53bca9bc292ec9b.png?resizew=530)
(1)求抛物线的解析式.
(2)如图1,连接
、
,点
在对称轴左侧的抛物线上,若
,求点
的坐标.
(3)如图2,过点
的直线
,点
是直线
上方抛物线上一动点,过点
作
,垂足为点
,连接
,
,
,
.当四边形
的面积最大时,求点
的坐标及四边形
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96dde9c4aad0536c069127df0d4b12f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62855ff21228ecea8e28fd0fbeb814ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e00948ef06a3e3d6853e626ae47a25e6.png)
![](https://img.xkw.com/dksih/QBM/2022/11/22/3114868951801856/3117927391846400/STEM/5f41b982a387409ca53bca9bc292ec9b.png?resizew=530)
(1)求抛物线的解析式.
(2)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a458aa4e438a9b1e6cd54827c30ce76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3b129de312166ddc54f822b3c88be9e.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/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9e312bc0401546bc01231f7720a928a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f53330c107f8245290a5a42c3d356acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf702adb116c1e46569eb7050d029f49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de6b96f44e4f6bfc49f9abd52cbf4971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23cb23f9075fe81e63edfa600f0dffd0.png)
您最近一年使用:0次
7 . 向阳村养鸡专业户李明2020年的纯收入是6万元,预计2022年的纯收入是7.26万元.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/89c6132f-8de5-48e0-b13b-5055df84a50a.png?resizew=170)
(1)求李明这两年纯收入的年平均增长率;
(2)随着养鸡规模不断扩大,李明需要再建一个养鸡场,他计划用一段长为100米的篱笆围成一个一边靠墙的矩形养鸡场(如图),墙长50米,养鸡场面积为1200米2,求养鸡场与墙平行的一边的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/27/89c6132f-8de5-48e0-b13b-5055df84a50a.png?resizew=170)
(1)求李明这两年纯收入的年平均增长率;
(2)随着养鸡规模不断扩大,李明需要再建一个养鸡场,他计划用一段长为100米的篱笆围成一个一边靠墙的矩形养鸡场(如图),墙长50米,养鸡场面积为1200米2,求养鸡场与墙平行的一边的长度.
您最近一年使用:0次
8 . 如图,抛物线
与x轴负半轴交于点
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/2933ef06-7645-412b-9a57-9573a781bece.png?resizew=500)
(1)求抛物线的解析式;
(2)若D是第四象限内抛物线上一点,且
,求四边形
的面积;
(3)将△ACO绕平面内点P顺时针旋转
后,得到
(点A,C,O的对应点分别是点
),
两点刚好在抛物线上,求
,P两点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53eb2d1e0c05c0a15bf80235ecf915ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be0977382ca08da9ca0226c4eb5e023f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/2933ef06-7645-412b-9a57-9573a781bece.png?resizew=500)
(1)求抛物线的解析式;
(2)若D是第四象限内抛物线上一点,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c05327cf112718145ffc8b104e0c18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1003c2b33b7c62519e8e2c59b19ffd2d.png)
(3)将△ACO绕平面内点P顺时针旋转
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecfa5b806b9bc3d2c4b660d5127a9329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80978334f2200fcebaca334eba18d631.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d540f6b930657a3d3c9fb4b79273fb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
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9 . 如图,用一段长为40m的篱笆围成一个靠墙的矩形菜园,墙长18m,这个矩形的长宽各为多少时,菜园的面积最大?最大面积是多少?
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/20/974b6e62-212d-4504-8b06-0ea01b9fc447.png?resizew=163)
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10 . 如图,在直角坐标系中,二次函数
的图象与x轴相交于点
和点
,与y轴交于点C.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/092e7b7a-355f-49c4-b967-da321c1fbf9b.png?resizew=267)
(1)求b、c的值;
(2)点
为抛物线上的动点,过P作x轴的垂线交直线l:
于点Q.
①当
时,求P点到直线l:
的距离的最大值;
②是否存在m,使得以点O、C、P、Q为顶点的四边形是菱形,若不存在,请说明理由;若存在,请直接写出m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/2022/11/17/092e7b7a-355f-49c4-b967-da321c1fbf9b.png?resizew=267)
(1)求b、c的值;
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82aaa597a5aa6176863eda3fdf83e181.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1464ddc459a7d19e2ff4e322c171e123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
②是否存在m,使得以点O、C、P、Q为顶点的四边形是菱形,若不存在,请说明理由;若存在,请直接写出m的值.
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