题目
题型:不详难度:来源:
如图
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080204-40525.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080204-11787.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080204-88282.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080205-60540.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080205-60540.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080205-17943.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080205-20039.jpg)
(1)5次以内能到
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080205-60540.gif)
(2)从开始到停止,可能出现的跳法有多少种?
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080205-60540.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080205-23851.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080205-74098.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080206-27378.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080206-93010.gif)
其一,跳三次到达
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080205-60540.gif)
其二,跳五次停止(前三次不到
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080205-60540.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080206-36130.gif)
故共有6+189=195种不同的跳法。
解析
核心考点
试题【(本大题共12分)如图 为正方体,一只青蛙开始在顶点A处,它每次可随意跳到相邻三顶点之一,若在五次内跳到点,则停止跳动;若5次内不能跳到点,跳完五次也停止跳动】;主要考察你对线线角等知识点的理解。[详细]
举一反三
如图(1)是一正方体的表面展开图,
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080155-21125.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080156-20463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080155-21125.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080156-20463.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080156-50923.gif)
(Ⅰ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080156-94984.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080156-40755.gif)
(Ⅱ)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080157-62616.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080156-40755.gif)
(Ⅲ)求二面角
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080157-90184.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080148-35845.gif)
已知直角梯形
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080149-71561.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080149-62572.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080149-92670.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080149-96020.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080149-18726.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080149-56037.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080149-43252.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080149-69325.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080149-13177.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080149-30065.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080150-17444.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080150-37871.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080150-66842.jpg)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080150-61680.gif)
(2)设四棱锥D-ABCE的体积为
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080150-78172.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080150-77045.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080150-74942.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080150-77045.gif)
已知正四棱锥
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080137-52518.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080137-86537.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080138-52959.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080138-36509.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080138-46118.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080138-31503.gif)
(1)求此正四棱锥的体积.
(2)求异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080139-64570.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080139-74034.gif)
![](http://img.shitiku.com.cn/uploads/allimg/20191022/20191022080139-27723.gif)
A.异面 | B.平行 | C.相交 | D.不确定 |
A.0条 | B.1条 | C.0条或1条 | D.无数条 |
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