名校
解题方法
1 . 如图所示,在四棱锥P
ABCD中,底面ABCD是∠DAB=60°且边长为
的菱形,侧面PAD为正三角形,其所在的平面垂直于底面ABCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/8e840a11-4094-44e7-a891-60a94a13ce96.png?resizew=188)
(1)若G为AD边的中点,求证:BG⊥平面PAD;
(2)若E为BC边的中点,能否在棱PC上找一点F,使得PA//平面DEF?并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b700fa9aeb1016aa71f76e4b6bb212e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/8e840a11-4094-44e7-a891-60a94a13ce96.png?resizew=188)
(1)若G为AD边的中点,求证:BG⊥平面PAD;
(2)若E为BC边的中点,能否在棱PC上找一点F,使得PA//平面DEF?并证明你的结论.
您最近一年使用:0次
2022-11-02更新
|
786次组卷
|
6卷引用:江西省丰城中学2022-2023学年高一下学期期末考试数学试题
江西省丰城中学2022-2023学年高一下学期期末考试数学试题四川省眉山市仁寿第一中学南校区2022-2023学年高二上学期期中考试数学(理)试题四川省眉山市仁寿第一中学南校区2022-2023学年高二上学期期中考试数学(文)试题(已下线)专题8-4 非建系型:探索性平行与垂直证明及求角度(已下线)8.6.3平面与平面垂直(第2课时平面与平面垂直的性质定理)(精练)-【精讲精练】2022-2023学年高一数学下学期同步精讲精练(人教A版2019必修第二册)(已下线)专题09 基本图形的平行与垂直-期中期末考点大串讲(苏教版2019必修第二册)
2 . 请选择适当的方法证明下列结论:
(1)求证:
;
(2)已知
,求证:
.
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c1d583e670dac4530bd57ac9118740.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e10cc5dd849caccce37fe98a26c598.png)
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2022-04-02更新
|
510次组卷
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4卷引用:江西省抚州市七校2021-2022学年高二下学期期末考试数学(理)试题
3 . 如图,在四棱锥
中,
为正三角,平面
平面
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/979fa138-6957-4c2f-ba00-661203ea65ad.png?resizew=168)
(1)求证:平面
平面
;
(2)求三棱锥
的体积;
(3)在棱
上是否存在点
,使得
平面
?若存在,请确定点
的位置并证明;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10df84d553a8826a7ce9bff4bf0d95b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65096f2be416307cfd3941b32e033f0c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/19/979fa138-6957-4c2f-ba00-661203ea65ad.png?resizew=168)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d452a7b850cd3a15b23619ad39bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddfe0ccf24d760c77535a70c92dad145.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ded79745d0a7d82c3884fdff5a52c19f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
您最近一年使用:0次
20-21高一上·全国·课后作业
名校
4 . 已知
,满足
.
(1)求证:
;
(2)现推广:把
的分子改为另一个大于1的正整数
,使
对任意
恒成立,试写出一个
,并证明之.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c0e9d1ad9561d693958756ee8398218.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3aec1994a01be9e9335a62177131ee4.png)
(2)现推广:把
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32df45c5ee591bb2b763deacb26110c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942932aac23ed64c833aacaae02e66bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce613eaa5df46a50174085ef5d1087fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
您最近一年使用:0次
2021-04-18更新
|
302次组卷
|
4卷引用:江西省抚州市黎川县第一中学2020-2021学年高一下学期期末数学(理)试题
江西省抚州市黎川县第一中学2020-2021学年高一下学期期末数学(理)试题(已下线)3.2.2 基本不等式的应用(练习)-2020-2021学年上学期高一数学同步精品课堂(新教材苏教版必修第一册)(已下线)3.2 基本不等式(2)应用与难点(课堂培优)-2021-2022学年高一数学课后培优练(苏教版2019必修第一册)(已下线)2.2 (分层练)基本不等式-2021-2022学年高中数学必修第一册课时解读与训练(人教A版2019)
名校
解题方法
5 . 已知
,若m,
,求证:
(1)![](https://staticzujuan.xkw.com/quesimg/Upload/formula/736085d5dadfb7081c13acb12899490a.png)
(2)设a,b是两个不相等的正数,且
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bdcfc71b422a73d7110b17e57c0e161.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9b6ad6f6fce0c84edfbc7b9802e3d7.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/736085d5dadfb7081c13acb12899490a.png)
(2)设a,b是两个不相等的正数,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f00f997ae12c30f551adb834e1d7ef8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5d2a320b9ff137ce3632296c4b1d79a.png)
您最近一年使用:0次
6 . (1)已知等差数列
,
,求证:
仍为等差数列;
(2)已知等比数列
,
,类比上述性质,写出一个真命题并加以证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/507d7b946bbd474c10eeebca6dc096d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
(2)已知等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ef4c4439b36c2847b0056a116d56d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdee73abf72b450eedb34a7101b0384.png)
您最近一年使用:0次
解题方法
7 . 在直三棱柱
中,四边形
是边长为3的正方形,
,
,点
分别是棱
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/cd310c53-ba9e-4d45-8b70-1aecc6b5f8ed.png?resizew=151)
(1)求
的值;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ac61c24f99a4e466f1e2ea011893866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/269c684310d0f7b5b9bf0a291e7ee748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4dfea6353fc25e88535e865a4982cb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/23/cd310c53-ba9e-4d45-8b70-1aecc6b5f8ed.png?resizew=151)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bfb6876bfebf8175326c61d394cdbb2.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4999d4fbcbe15f78c29d518f25d317c2.png)
您最近一年使用:0次
解题方法
8 . 甲、乙两个篮球队在4次不同比赛中的得分情况如下:
(1)在4次比赛中,求甲队的平均得分;
(2)分别从甲、乙两队的4次比赛得分中各随机选取1次,求这2个比赛得分之差的绝对值为1的概率;
(3)甲,乙两队得分数据的方差分别记为
,
,试判断
与
的大小(结论不要求证明)
甲队 | 88 | 91 | 93 | 96 |
乙队 | 89 | 94 | 97 | 92 |
(2)分别从甲、乙两队的4次比赛得分中各随机选取1次,求这2个比赛得分之差的绝对值为1的概率;
(3)甲,乙两队得分数据的方差分别记为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a669412290af652fc6eb84909b9b2310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a639d13faa2e8ba41e49cd18fe5c7292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a669412290af652fc6eb84909b9b2310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a639d13faa2e8ba41e49cd18fe5c7292.png)
您最近一年使用:0次
2024-01-29更新
|
211次组卷
|
2卷引用:江西省上饶市北大邦实验学校2023-2024学年高一上学期期末质量检测数学试题
名校
解题方法
9 . 在荾形
中,
,
,将菱形
沿着
翻折,得到三棱锥
如图所示,此时
.
平面
;
(2)若点
是
的中点,求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bbaccd578a43b2397c8bdd50592fa07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c013bbe1fb6e9acf461548b5cf6cd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
您最近一年使用:0次
2023-12-31更新
|
405次组卷
|
4卷引用:江西省部分学校2023-2024学年高二上学期1月期末数学试题
名校
10 . 将长方体
沿截面
截去一个三棱锥后剩下的几何体如图所示,其中
,
,
分别是
,
的中点.
(1)求证:
平面
;
(2)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a40d8806b86572352ed08aa2b7f89f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/535d6932f4759170e7077e65a6afabb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/29/597ea7da-0496-48a5-a17d-62680a6d7599.png?resizew=126)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0974bbb15110690a78bea168124b414.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a7494edc88340385272679347b6af2.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ef601ca1f9c4c031adab4ffed297f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34a7494edc88340385272679347b6af2.png)
您最近一年使用:0次
2023-12-29更新
|
1087次组卷
|
9卷引用:江西省上饶市广丰区私立康桥中学2023-2024学年高二上学期期末模拟数学试题
江西省上饶市广丰区私立康桥中学2023-2024学年高二上学期期末模拟数学试题四川省凉山州安宁河联盟2023-2024学年高二上学期期末联考数学试题(已下线)每日一题 第4题 线面夹角 向量帮忙(高二)(已下线)每日一题 第4题 线面夹角 向量帮忙(高二)宁夏回族自治区银川市贺兰县第一中学2023-2024学年高二上学期期末复习数学试题(三)山东省潍坊市临朐县第一中学2023-2024学年高二上学期期末模拟数学试题(已下线)专题13 空间向量的应用10种常见考法归类(4)(已下线)6.3 空间向量的应用 (4)(已下线)高二上学期期末考点大通关真题精选100题(1)