1 . 正方体的棱、面上的对角线及正方体的体对角线,它们本身及相互之间构成的异面直线共有( )对.
A.73 | B.144 | C.174 | D.178 |
您最近一年使用:0次
解题方法
2 . 正方体
中,点
为BC中点,点
在
上,
:2,则平面
与底面
所成的二面角为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.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/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b63de67e83ad2a0d302aeaceb81bd507.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589c878e789e07e33d65c8a18cf2c58a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
您最近一年使用:0次
3 . 设
的图象与任何斜率不小于2的直线至多有1个公共点,则
的范围为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a9793ffcfa3a32d392d24d55af3468c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
名校
4 . 在平面直角坐标系
中,点
,直线
,设圆C的半径为1,圆心在l上,若圆C上存在点M,使得
,则圆心C的横坐标取值范围为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f94c4f6b762fddb0e313050ef6932eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/098afd9209a075f9c8d9dfbbb34aeee0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed154dc722c0576255346d7f237969ac.png)
您最近一年使用:0次
2020-11-13更新
|
27次组卷
|
5卷引用:第十三届高二试题(A卷)-“枫叶新希望杯”全国数学大赛真题解析(高中版)
解题方法
5 .
、
是已知圆
的两条互相垂直的半径,延长
至点P,延长
至点Q.使得
,
.
(1)若直线OP和OQ的斜率都存在,试确定直线OP和OQ的斜率的乘积是否为一个常数?
(2)试确定
是否为一个常数?
(3)设
.试确定是否存在两个定点
、
,使
,
的斜率的乘积为一个常数?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88ec2dbad3fa6208c0493291e5ccdcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f304a24bb2e199772c53223db7b4be9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f240cccaf24af8a796abb95cb42be52e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88ec2dbad3fa6208c0493291e5ccdcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f304a24bb2e199772c53223db7b4be9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d388a3e54d3a0a19d064fc7ca00459b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799a839722766253265f9da8d582982b.png)
(1)若直线OP和OQ的斜率都存在,试确定直线OP和OQ的斜率的乘积是否为一个常数?
(2)试确定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc54eca5a663aa7a6bc2273bc05869d.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074185b639a471cbc8107e54bac0fe66.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/9399c9a2a31b0e3165aea2d6ccc4f7c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07c2cc110e46ae4b3432814810e28bcf.png)
您最近一年使用:0次
6 . 直线
绕原点逆时针方向旋转30°后,所得直线与圆
的位置关系为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d532ce76942846df88c6f66112e50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33bcf46f1bb0d01620c1cbe79beece42.png)
A.直线过圆心 | B.直线与圆相交,但不过圆心 |
C.直线与圆相切 | D.直线与圆没有公共点 |
您最近一年使用:0次
7 . 方程
所表示的曲线围成的图形面积为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c19cef9d1a88d5827be91241d31094f5.png)
您最近一年使用:0次
8 . 与圆
相切且在
轴、
轴上截距相等的直线共有___________ 条.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77ea6d4be629db81d46c89fdf3aae30b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
您最近一年使用:0次
9 . 在正方体
中,点
、
分别是
、
上的点,
,
,
,则点
到
的距离为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.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/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc39144b305c67d44410d41053a1d28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b41f05ecffc286c2e69acdff27a8b335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
您最近一年使用:0次
解题方法
10 . 三棱锥
中有四条棱长为
,另外两条棱长为
和2,则较长的两条棱所成的夹角为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
您最近一年使用:0次