题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001746-70781.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001746-67374.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001747-69641.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001747-24286.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001747-12725.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001747-69734.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001748-13768.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001748-82167.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001748-25690.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001748-22735.jpg)
(I )求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001748-99867.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001749-44784.jpg)
(II)求多面体
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001749-93844.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001749-68458.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001750-34047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001750-80011.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001750-22371.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001750-19897.png)
又∵
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001750-16271.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001751-89136.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001751-34712.png)
(Ⅱ)解析:由题知:三棱柱
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001751-42519.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001751-89173.png)
∵
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001752-91816.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001752-30472.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001752-32362.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001752-34377.png)
∴
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001752-83624.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001753-83117.png)
∴多面体
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001753-16409.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001753-47582.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001753-53898.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001754-73783.png)
解析
核心考点
试题【如图1所示,在边长为12的正方形中,点B、C在线段AD上,且AB = 3,BC = 4,作分别交于点B,P,作分别交于点,将该正方形沿折叠,使得与重合,构成如图】;主要考察你对空间几何体的结构特征等知识点的理解。[详细]
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001730-21822.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001730-60244.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001731-47085.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001731-29226.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001731-49223.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001723-57390.png)
(1)求异面直线
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001724-29220.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001724-63390.png)
(2)求此多面体的体积(结果用最简根式表示).
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001724-41212.jpg)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001718-83065.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001718-20975.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001718-42623.png)
求证:①
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001718-19876.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001719-52868.png)
②平面
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001719-78396.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001719-98957.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001711-77260.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001712-72540.png)
A.4条 | B.6条 | C.8条 | D.10条 |
![](http://img.shitiku.com.cn/uploads/allimg/20191021/20191021001704-95346.png)
最新试题
- 1已知tan(α+π4)=12,且-π2<α<0,则2sin2α+sin2αcos(α-π4)=______.
- 2(本小题满分12分)在中,分别是的对边长,已知.(I)若,求实数的值;(II)若,求面积的最大值.
- 3如图所示,把电荷量为-5×10-9 C的电荷,从电场中的A点移到B点,其电势能___________(填”增大””减小”
- 4汽车正以20m/s的速度行驶,驾驶员突然发现前方有障碍,便立即刹车,开始做匀减速直线运动,1s后速度大小变为15m/s,
- 5将1,2,3, ……,100 这100 个自然数, 任意分为50 组, 每组两个数,现将每组的两个数中任一数值记作a,
- 6Ⅰ下表是进行某实验时不同的处理方法,据表回答下列问题:试管加入物质(ml)处理温度处理时间1号淀粉糊(2ml)+清水(2
- 7已知函数。 (1)若方程在上有解,求的取值范围; (2)在中,分别是所对的边,当(1)中的取最大值,且时,求的最
- 8若角α是第二象限的角,则α2是( )A.第一象限或第二象限的角B.第一象限或第三象限的角C.第二象限或第四象限的角D.
- 9加热31.6g KMnO4,当得到3gO2时,剩余固体的成分是[ ]A.K2MnO4和MnO2B.KMnO4和K
- 10Mom makes me eat an apple a day the doctor away.A.keeps
热门考点
- 1下列装置中,能发生原电池反应的一组是( )A.①③⑤B.②④C.③⑤D.①③
- 2计算:。
- 3下图是测定发芽的小麦种子的呼吸类型所用装置(假设呼吸底物只有葡萄糖,并且不考虑外界条件的影响),下列有关说法错误的是[
- 4分类单位从大到小的排列顺序是:门、界、纲、目、科、属种。 ( )
- 5如下图所示为某种高等动物不同细胞分裂的图像,下列与此相关的不正确叙述是[ ]A.①②③所示细胞具有同源染色体B.
- 6苹果公司的产品一直站在潮流的尖端,从最初的超大容量MP3播放器ipod,到划时代的触屏手机iphone,再到先声夺人的平
- 760kg的人站在跷跷板某一位置时,跷跷板处于如图所示的平衡状态。由此可估测球的质量约为 A.20kg
- 8如果∠α和∠β互为补角,并且∠β的一半比∠α小30°,求∠α和∠β的度数.
- 9You look so tired. You _____ have stayed up late again. [
- 10已知中心在坐标原点的双曲线C的焦距为6,离心率等于3,则双曲线C的标准方程为 .