1 . 椭圆
的中心、右焦点、右顶点及右准线与
轴的交点依次为
.则
的最大值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ed1f75ca12198ad1f5e7957e75a45ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5e2e35dd46df1bf2ff4dbf1612b5387.png)
A.![]() | B.![]() | C.![]() | D.不确定 |
您最近一年使用:0次
2 . 用红、黄、蓝、绿四种颜色给图中的
、
、
、
四个小方格涂色(允许只用其中几种),使邻区(有公共边的小格)不同色,则不同的涂色方式种数为
![](https://img.xkw.com/dksih/QBM/2019/6/14/2225593030877184/2225638470320128/STEM/1ec148e8f0ab46cebcf9735fa8dda6cb.png?resizew=56)
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2019/6/14/2225593030877184/2225638470320128/STEM/1ec148e8f0ab46cebcf9735fa8dda6cb.png?resizew=56)
A.24 | B.36 | C.72 | D.84 |
您最近一年使用:0次
2015-08-19更新
|
1096次组卷
|
5卷引用:2007年全国高中数学联赛江西省预赛试题