名校
1 . 函数
的图象绕着原点旋转弧度![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
,若得到的图象仍是函数图象,则
可取值的集合为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfeb49a8a6565e67c37a7c4a787af997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87278c97d1839a69da2423c8c3d2200.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
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2020-12-02更新
|
620次组卷
|
4卷引用:上海市闵行区七宝中学2021届高三上学期期中数学试题
上海市闵行区七宝中学2021届高三上学期期中数学试题(已下线)热点07 解析几何-2021年高考数学【热点·重点·难点】专练(上海专用)上海市上海师范大学附属中学2022届高三上学期10月月考数学试题上海市南洋模范中学2024届高三上学期开学考试数学试题
名校
2 . 如图,圆
与长轴是短轴两倍的椭圆
:
相切于点![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25e326fdf9e5456f48e8a99a069f379.png)
![](https://img.xkw.com/dksih/QBM/2020/2/9/2395383259963392/2395553367908352/STEM/5b1952a5-d62f-471a-a76f-dd6a0e321477.png?resizew=421)
(1)求椭圆
与圆
的方程;
(2)过点
引两条互相垂直的两直线
与两曲线分别交于点
与点
(均不重合).若
为椭圆上任一点,记点
到两直线的距离分别为
,求
的最大值,并求出此时
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/166703f700475d6bcd4b8ee7c71f2c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5374fe08066d3e02b28420a0b77964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b25e326fdf9e5456f48e8a99a069f379.png)
![](https://img.xkw.com/dksih/QBM/2020/2/9/2395383259963392/2395553367908352/STEM/5b1952a5-d62f-471a-a76f-dd6a0e321477.png?resizew=421)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/166703f700475d6bcd4b8ee7c71f2c7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532af83c6a8d570fbabd4dfa2c5c227b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098a3e7d1f1890863b7483a98b618119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbdb21011ea821b91d539cb763aac649.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf2f1c1409a06278e847e6b573cef254.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d389b159122d91c6e959db5d682aa9bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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2020-02-09更新
|
236次组卷
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2卷引用:上海市上海中学2017届高三上学期10月月考数学试题
名校
3 . 在平面直角坐标系
中,长度为2的线段EF的两端点E、F分别在两坐标轴上运动.
(1)求线段EF的中点G的轨迹C的方程;
(2)设轨迹C与
轴交于
两点,P是轨迹C上异于
的任意一点,直线
交直线
于M点,直线
交直线
于N点,求证:以MN为直径的圆C总过定点,并求出定点坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
(1)求线段EF的中点G的轨迹C的方程;
(2)设轨迹C与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840106298ac20f7a80fea2531dd71686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840106298ac20f7a80fea2531dd71686.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2977eea43a781e06d93e04a395a309.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46b053f98b1d05a2043e94eeaefea87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2977eea43a781e06d93e04a395a309.png)
您最近一年使用:0次
名校
4 . 在平面直角坐标系中,已知双曲线
分别为
的左,右顶点.
(1)以
为圆心的圆与
恰有三个不同的公共点,写出此圆的方程;
(2)直线
过点
,与
在第一象限有公共点
,线段
的垂直平分线过点
,求直线
的方程;
(3)
上是否存在异于
点
,使
成立,若存在,求出所有
的坐标,若不存在说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5827ab82b55d33d7b86ad3f4be1e359d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
(1)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b454cdb97c408300b50d945f002c2cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364b5e6f1e7ff98fc289826db55e6735.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
您最近一年使用:0次
名校
5 . 已知圆
过定点
,圆心
在抛物线
上,
、
为圆
与
轴的交点.
(1)求圆
半径的最小值;
(2)当圆心
在抛物线上运动时,
是否为一定值?请证明你的结论;
(3)当圆心
在抛物线上运动时,记
,
,求
的最大值,并求此时圆的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/383f12cb70ca55eba4ff012771dbfa9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10f4123c19136d3a4dc040dce8e34e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(1)求圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)当圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084cf5ffced059f5653ee2a1023518b7.png)
(3)当圆心
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad28374d45ca7b6319be74c29f74be0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba498a1c73700f235c701d84932aba9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9c26ee0f01990cd336dc2452014ea0b.png)
您最近一年使用:0次
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6 . 把半椭圆
(
)与圆弧
(
)合成的曲线称作“曲圆”,其中
为
的右焦点,如图所示,
、
、
、
分别是“曲圆”与
轴、
轴的交点,已知
,过点
且倾斜角为
的直线交“曲圆”于
、
两点(
在
轴的上方).
![](https://img.xkw.com/dksih/QBM/2019/11/6/2328249906151424/2328327614136320/STEM/3d20999331614ef8a11027bbc7e23457.png?resizew=205)
(1)求半椭圆
和圆弧
的方程;
(2)当点
、
分别在第一、第三象限时,求△
的周长
的取值范围;
(3)若射线
绕点
顺时针旋转
交“曲圆”于点
,请用
表示
、
两点的坐标,并求△
的面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5543daf4013b75e359fad836827325fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec0f3793cc5ca6345962d5149ce63e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e541ea2f855f981c96207070683d388.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ba2238d6afe0187534155dd9ac48c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce30fc0664cca88dbe6d38f32aee81e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4300eb1f62d8a678f47ca26c2864b854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/2019/11/6/2328249906151424/2328327614136320/STEM/3d20999331614ef8a11027bbc7e23457.png?resizew=205)
(1)求半椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce30fc0664cca88dbe6d38f32aee81e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aaafb050b24c4e806c480e0665aaa5a.png)
(2)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1253885737cd104e24ddd2d4c96e4c86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)若射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c2293f93791a597bf0162411f3395f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ad72d7565699d1ebb741eb0ce12bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40a277f9299815eff910bd655d0747bd.png)
您最近一年使用:0次
2019-11-06更新
|
433次组卷
|
2卷引用:2019年上海市松江区高三4月模拟考质量监控(二模)数学试题
名校
7 . 已知平面直角坐标系中两点
、
,
为原点,有
.设
、
、
是平面曲线
上任意三点,则
的最大值为________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1659b946eb8d4239ddb4bad6a9ff8cab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38bfda4c801fcd0a23bea177cbb6dc62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2344a74757d7a7951c6d5fe283fe9a11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fba1e1ca5040060dde64c667ec432a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f05eb4c4c6f9e6a702735bc0b5122d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c63f076ea3f49e5b4d69611e53fdce3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecdc455609e1d5448fdc72d3dbac6be5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b250fc4d10981212bec195ad43b3c8d.png)
您最近一年使用:0次
2019-08-17更新
|
932次组卷
|
6卷引用:上海市育才中学2018-2019学年高三下学期三模数学试卷
上海市育才中学2018-2019学年高三下学期三模数学试卷2018年上海市七宝中学高考模拟三模数学试题上海市上海交通大学附属中学2021届高三上学期期末数学试题上海市七宝中学2021届高三冲刺模拟卷一数学试题(已下线)专题18 直线和圆的方程(模拟练)-1(已下线)专题18 直线和圆的方程(练习)-1
名校
8 . 在直角坐标系内,已知
是以点
为圆心的圆上的一点,折叠该圆两次使点
分别与圆上不相同的两点(异于点
)重合,两次的折痕方程分别为
和
,若圆上存在点
,使得
,其中点
、
,则
的取值范围为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c53c2ce5532642de107e0d85c75f3e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b979396a703fb14715ba39232f5786a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d075d90985d30e8e1794fc3dc98c39a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2da680339329f6512838692d3815b9ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d4448cf42dc9615fc620345d5e4bea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaa45abe92fbac31148e397b8fb54507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2018-07-04更新
|
1610次组卷
|
6卷引用:2.1.1-2.1.2 圆的标准方程 圆的一般方程(十一大题型)(分层练习)-2023-2024学年高二数学同步精品课堂(沪教版2020选择性必修第一册)
(已下线)2.1.1-2.1.2 圆的标准方程 圆的一般方程(十一大题型)(分层练习)-2023-2024学年高二数学同步精品课堂(沪教版2020选择性必修第一册)【全国百强校】江西省抚州市临川区第一中学2017-2018学年高二下学期期末考试数学(理)试题山西省大同市第一中学2020届高三下学期2月模拟二数学(理)试题(已下线)强化卷09(3月)-冲刺2020高考数学之拿高分题目强化卷(山东专版)(已下线)2.3 圆与圆的位置关系(课堂培优)-2021-2022学年高二数学课后培优练(苏教版2019选择性必修第一册)(已下线)专题08 直线和圆的方程的压轴题(二)-【尖子生专用】2021-2022学年高二数学考点培优训练(人教A版2019选择性必修第一册)
名校
9 . 如图,扇形的圆心角为90°,半径为1,点
是圆弧
上的动点,作点
关于弦
的对称点
,则
的取值范围为
您最近一年使用:0次
2018-05-08更新
|
3831次组卷
|
3卷引用:上海市上海交大附中2022届高三下学期5月月考数学试题
10 . 某市为改善市民出行,大力发展轨道交通建设.规划中的轨道交通
号线线路示意图如图所示.已知
是东西方向主干道边两个景点,
是南北方向主干道边两个景点,四个景点距离城市中心
均为
,线路
段上的任意一点到景点
的距离比到景点
的距离都多
,线路
段上的任意一点到
的距离都相等,线路
段上的任意一点到景点
的距离比到景点
的距离都多
,以
为原点建立平面直角坐标系
.
(1)求轨道交通
号线线路示意图所在曲线的方程;
(2)规划中的线路
段上需建一站点
到景点
的距离最近,问如何设置站点
的位置?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4e0453b147246c2b2efba114e7c0101.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a83528ebf9d36a2b47a01f8ecae7e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a83528ebf9d36a2b47a01f8ecae7e02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
(1)求轨道交通
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
(2)规划中的线路
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/18/31217b35-02c8-44c5-b589-e71e4e76a705.png?resizew=176)
您最近一年使用:0次
2018-04-19更新
|
789次组卷
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2卷引用:上海市普陀区2018届高三下学期质量调研(二模)数学试题