解题方法
1 . 圆锥
的底面半径为
,母线长为
,
是圆锥
的轴截面,
是
的中点,
为底面圆周上的一个动点(异于
、
两点),则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
A.存在点![]() ![]() | B.存在点![]() ![]() |
C.三棱锥![]() ![]() | D.三棱锥![]() ![]() |
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名校
2 . 已知两条不同的直线l,m及三个不同的平面α,β,γ,下列条件中能推出
的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f747152f006301e03b643afb80195c.png)
A.l与α,β所成角相等 | B.![]() ![]() |
C.![]() ![]() ![]() | D.![]() ![]() ![]() |
您最近一年使用:0次
2023-04-24更新
|
2092次组卷
|
9卷引用:宁夏回族自治区银川一中2023届高三三模数学(理)试题
宁夏回族自治区银川一中2023届高三三模数学(理)试题宁夏回族自治区石嘴山市第三中学2023届高三第四次模拟考试数学(文)试题黑龙江省齐齐哈尔市2023届高三一模数学试题(已下线)模块六 专题11 易错题目重组卷( 黑龙江卷)第八章 立体几何初步(单元测试)-【同步题型讲义】天津市第四十二中学2022-2023学年高一下学期5月月考数学试题山东省济宁市微山县第二中学2022-2023学年高一下学期6月月考数学试题(已下线)第七章 立体几何与空间向量 第三节?第二课时直线,平面平行的判定与性质(讲)(已下线)第四节?直线,平面垂直的判定与性质(讲)
3 . 如图,在梯形
中,
∥
,
,
,平面
平面
,四边形
是矩形,
,点
在线段
上.
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/c1ef9ef6d0d24be5acaf0fe6afcde188.png)
(Ⅰ)求证:
平面
;
(Ⅱ)当
为何值时,
∥平面
?证明你的结论;
(Ⅲ)求二面角
的平面角的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/68f5ef31f20a4c379bd10a3fb2b3b0c7.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/6d834b46b8ba429f9eed15cfd1eb8dbc.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/731e4b16edfe4950b4ba9640003d5d6b.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/e62eed1cbd894981acfdc2e5ceefb20c.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/499f825f40334c66981cab494efb74cd.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/d65c720a0c2b44dbb01f476c3d5de217.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/68f5ef31f20a4c379bd10a3fb2b3b0c7.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/28858d1fa3e74f6299c575df9a9b523e.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/6a772d000010479fb81c6d5f013b200d.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/1f4ed11a77fb421e989a852d3b3371ba.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/e1acdbac12c14748ac8bb416865a4eab.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/c1ef9ef6d0d24be5acaf0fe6afcde188.png)
(Ⅰ)求证:
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/2641d41d490540b4bab05389115142dd.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/28858d1fa3e74f6299c575df9a9b523e.png)
(Ⅱ)当
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/68636c28fc74406ca34c7967d12a83e7.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/f1aa6ef2b9444e198a0005c40221ec0f.png)
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/7ad087e8e9894940880c88e036f41421.png)
(Ⅲ)求二面角
![](https://img.xkw.com/dksih/QBM/2016/9/23/1573037998727168/1573038004748288/STEM/e2071501b19e4315af7a163d7a878aef.png)
您最近一年使用:0次
2016-12-04更新
|
453次组卷
|
2卷引用:2016届宁夏银川唐徕回民中学高三下三模理科数学试卷
4 . 如图,在直三棱柱
中,底面ABC是正三角形,点D是BC的中点,
.
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/3beb857adb574b119409f912f93b4607.png)
(1)求证:
平面
;
(2)试在棱
上找一点M,使得
,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad91719bd5fdc1b2d3d5298f2f44cc2.png)
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/3beb857adb574b119409f912f93b4607.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/52eebb968c80413faa903055942421c6.png)
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/db25bff34ae0496db6f33a23f8c6ff29.png)
(2)试在棱
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/04139598a88f4119a42145567ed45869.png)
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623788318720/1572623793758208/STEM/3a40c69341b84501921c9c2a04188436.png)
您最近一年使用:0次
5 . 如图,在四棱锥
中,底面
是正方形,侧面
是正三角形,
,E为PC的中点.
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623538077696/1572623543697408/STEM/095ea4ae937c479b9723e06b2f56f937.png)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6153163fecdf3f410411048428ccaef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10d8ee4d341e58ff69579737b9b0589a.png)
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623538077696/1572623543697408/STEM/095ea4ae937c479b9723e06b2f56f937.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/152cfd5011c94e02c1a9cbbd4d8f58bb.png)
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623538077696/1572623543697408/STEM/dc7645b22164429bb81fd1928bba2e2c.png)
(2)求二面角
![](https://img.xkw.com/dksih/QBM/2016/5/9/1572623538077696/1572623543697408/STEM/58fe626aa3b148f8afe6bf86b09d3539.png)
您最近一年使用:0次
6 . 已知直线
,
和平面
,
,下列命题中正确的是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d1a34ae2b8c77f8d7e355c6d1d667e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74c62c14a017007a6bdfe25eada9c433.png)
A.若![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
2016-12-03更新
|
711次组卷
|
3卷引用:宁夏石嘴山市第三中学2021届高三四模数学(文)试题
7 . 已知直线m、n和平面
,则m∥n的必要非充分条件是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3d1a34ae2b8c77f8d7e355c6d1d667e.png)
A.m、n与![]() | B.m⊥![]() ![]() |
C.m∥![]() ![]() | D.m∥![]() ![]() |
您最近一年使用:0次