题目
题型:不详难度:来源:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-88039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-92102.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-49845.png)
(2)求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-65814.png)
答案
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-29031.png)
解析
试题分析:(1)在正方体
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-88039.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-35919.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-69480.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-65043.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021241-93199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021241-98308.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021241-93199.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021241-28448.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021241-76503.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021241-43992.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021241-85092.png)
(2)因为求直线
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-65814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021242-72403.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021242-29832.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021242-98739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021242-64958.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021242-41739.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021242-53726.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021243-70066.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-29031.png)
试题解析:(1)在正方体中
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021243-68659.png)
又
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021243-16756.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021243-43586.png)
则
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021244-94145.png)
而
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021244-30357.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021244-63428.png)
故
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-49845.png)
(2)连接
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021244-90981.png)
因为BD平行
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021245-62700.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021245-51662.png)
而三角形
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021245-26937.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021245-50739.png)
则直线
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-65814.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021240-29031.png)
核心考点
举一反三
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021230-84572.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021230-11803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021230-56465.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021230-85996.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021231-15004.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021231-68440.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021231-77077.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021231-96762.png)
其中真命题的有________(请填写全部正确命题的序号)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021215-96460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021215-31209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021216-98874.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021215-31209.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021216-36633.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021216-65808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021216-18510.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021217-98178.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021217-65364.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021217-44854.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021217-52910.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021218-98627.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021218-87056.png)
(2)若线段
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021218-72352.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021218-31290.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021219-17283.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021208-46047.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021208-60470.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021208-62803.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021208-51443.png)
(1)求证:EF//平面PAD;
(2)求证:平面
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021208-78521.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021209-41908.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021150-48966.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021150-66574.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021150-45263.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021151-99706.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021151-93806.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021151-73090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021151-32635.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021152-15456.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021152-94452.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021152-74190.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021152-93709.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021152-10543.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021153-15090.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021153-41775.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021153-81358.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021154-32551.png)
(1)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021154-47425.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021151-99706.png)
(2)求证:
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021154-49724.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021154-28578.png)
(3)求
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021155-34763.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021154-28578.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021139-15295.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021140-13460.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021140-76808.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021140-13799.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021140-21672.png)
①
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021141-78379.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021141-43614.png)
③
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021141-86229.png)
![](http://img.shitiku.com.cn/uploads/allimg/20191106/20191106021141-65476.png)
A.①③ | B.②③④ | C.②④ | D.①②③ |
最新试题
- 1已知函数有两个零点,则有 A.B.C.D.
- 2若集合,,则( )A.0B. C.D.
- 3下列词语中加点的字的注音有误的一组是 A.歼灭qiān 恪守kè
- 4女性生殖系统中,产生卵子的结构是[ ]A.子宫B.睾丸C.卵巢D.输卵管
- 5 Tourism is important ______ Oxford and Grenoble, and they a
- 6有关我国农业生产的叙述,错误的是( )A.我国农耕区的畜牧业,以畜禽饲养为主B.我国四大牧区指的是内蒙古、新疆、青海、
- 7用所给单词的正确形式填空:two try wait health die小题1:I don’t fe
- 8(2012·山东)My first ________ of him was that he was a kind and
- 9计算化简:(1)=( );(2)=( )。
- 10如图,抛物线形拱桥的顶点距水面2米时,测得拱桥内水面宽为12米,当水面升高1米后,拱桥内水面宽度是多少米?
热门考点
- 1观察比较与归纳是学习化学的重要方法。对于以下三个化学方程式: ①镁+ 氧气氧化镁 ②碳 + 氧气二氧化碳 ③磷 + 氧气
- 2已知△ABC中,=,=,<0,=,=3,=5,则与的夹角为
- 3已知10(4m+n-3)2+(3m-n-4)2=0,请你写出方程mx-3ny=2的一组解______.
- 4一天中,陆地最高气温和最低气温一般出现在( )A.12时B.午后l时C.午后2时D.日出前后
- 5抛物线y=-2x2-4x+3的顶点坐标是______;抛物线y=-2x2+8x-1的顶点坐标为______.
- 6【题文】下表是地球不同纬度地区在二分二至日所受到的天文辐射日总量(卡/平方厘米)变化情况表,回答下列问题。(共16分)日
- 7不等式<0的解集为( )。
- 8 王昙首,琅邪临沂人,太保少弟也。幼有业尚,除著作郎,不就。兄弟分财,昙首唯取图书而已。辟琅邪王大司马属,从府公修复洛
- 9【题文】中国南极第四个考察站——泰山站于2014年1月建立。读“我国南极考察站分布图和景观图”,结合所学知识回答下列小题
- 10两年来,市教育局在全市中小学立题推进“构建和谐师生关系研究活动”,取得了显著成效。现在,这项活动在向纵深发展——“构建和