名校
1 . 设数列
是等差数列,
为其前
项和,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/627411fce8e2b6ab40ac1166b45ada6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36183db0759eec0e108274d229fcd00b.png)
A.它的首项是![]() ![]() | B.它的首项是![]() ![]() |
C.它的首项是![]() ![]() | D.它的首项是![]() ![]() |
您最近一年使用:0次
2021-10-31更新
|
420次组卷
|
2卷引用:青海师范大学附属实验中学2020-2021学年高二下学期期中考试数学(文)试题
名校
2 . 已知在极坐标系下,曲线
(
为参数)与点
.
(1)求曲线
与点
的位置关系;
(2)已知极坐标的极点与直角坐标原点重合,极轴与直角坐标的
轴正半轴重合,直线
,求曲线
与线
的交点的直角坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e1a214f2a18b7262d4a3dcd3208ff6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9002ffa612561172758f4dd1d26034.png)
(1)求曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)已知极坐标的极点与直角坐标原点重合,极轴与直角坐标的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c9e2310969a08dd715e5e12dcd8ace0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
您最近一年使用:0次
3 . 在极坐标系中,已知
,O为极点,求使
是正三角形的
点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8009e1ddafb7b44492b445face98046f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f66374bdbae6f1fb73d4ed1c5a0ae8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
您最近一年使用:0次
2021-08-09更新
|
168次组卷
|
3卷引用:青海省海南州高级中学、贵德中学2020-2021学年高二下学期期中联考数学(文)试题
4 . 加工某个零件分三道工序,第一道工序有5人,第二道工序有6人,第三道工序有4人,从中选3人每人做一道工序,则选法有______ 种.
您最近一年使用:0次
2021-08-09更新
|
206次组卷
|
2卷引用:青海省海南州高级中学、贵德中学2020-2021学年高二下学期期中联考数学(理)试题
名校
解题方法
5 . 已知
是平面,m是直线,从下列五个条件中选择若干个作为已知条件,能够得到
的是________ .(填入条件的序号即可)
①
;②
;③
;④
;⑤
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4e288596fa3811dd2c17bded60e82e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/808c6d37467a5c995d71e49408503927.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f747152f006301e03b643afb80195c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5986f2991d45fbf3578f08f27d9fd7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe920cd78db25f5b4df37d066e57800.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4042f9c51f83e3367d496e851735d7f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8325245621b6f13f92d05b0a2f2236fc.png)
您最近一年使用:0次
2021-08-05更新
|
548次组卷
|
2卷引用:青海省海南州中学、海南州贵德中学2021-2022学年高二上学期期中考试数学(文)试题