1 . 在四棱锥
中,平面
平面
,
为等边三角形,
,
,
,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/f1f9fdb1-7d4d-43a6-9769-373ae2e7ad05.png?resizew=226)
(1)求证:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/c6e2903ff33266528a7902ad51cf8d75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c313dff515240bc75d42f6687ac44cb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f79863ffcfa63117ca6741b20a48e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/3/f1f9fdb1-7d4d-43a6-9769-373ae2e7ad05.png?resizew=226)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d8d90d123fec1ae1b7b30dac9f88e05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/715cc9ea5e7d80930284ffb117142770.png)
您最近一年使用:0次
2020-02-09更新
|
867次组卷
|
6卷引用:甘肃省天水市秦州区第一中学2019-2020学年高二上学期期末数学(理)试题
名校
解题方法
2 . 如图所示,在梯形
中,
∥
,
⊥
,
,
⊥平面
,
⊥
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/c32e0b67-73e3-402a-83ba-a0731218d8c0.png?resizew=163)
(1)证明:
⊥平面
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/c32e0b67-73e3-402a-83ba-a0731218d8c0.png?resizew=163)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f6967901d6c855864df01e7bf7a15c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
您最近一年使用:0次
2019-07-11更新
|
3909次组卷
|
5卷引用:甘肃省天水市一中2020届高三一轮复习第一次模拟考试文科数学试题
名校
3 . 在平面直角坐标系
中,已知圆
的方程为
,
点的坐标为
.
(1)求过点
且与圆
相切的直线方程;
(2)过点
任作一条直线
与圆
交于不同两点
,
,且圆
交
轴正半轴于点
,求证:直线
与
的斜率之和为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f2beb91f10d2d8f2aa0dcc3f5cd1598.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f84269a13118a599708926a24c53d925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1a4e2d41655ea7214d61bf6ed34e1b.png)
(1)求过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e61620a272dada8d4b9a9fab6379dfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30513ea48bc1ef3ae78adac83d894f14.png)
您最近一年使用:0次
2019-02-06更新
|
2036次组卷
|
5卷引用:甘肃省天水市第一中学2020-2021学年高一上学期期末数学试题
4 . 如图,已知面
垂直于圆柱底面,
为底面直径,
是底面圆周上异于
的一点,
.求证:
![](https://img.xkw.com/dksih/QBM/2018/3/5/1895717974261760/1896870019506176/STEM/8ee788e9d3814e368307735ce0c56ec9.png?resizew=157)
(1)平面
平面
;
(2)求几何体
的最大体积
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4339a40ae9d1947ec3a4b3e2fa3a16cd.png)
![](https://img.xkw.com/dksih/QBM/2018/3/5/1895717974261760/1896870019506176/STEM/8ee788e9d3814e368307735ce0c56ec9.png?resizew=157)
(1)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50df3bc16f0c3ca31e7fe0f7c26ea3f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6b36a70bc52a720ba8750aee4924307.png)
(2)求几何体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38593653bedb845ecfa820806a29a1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be54e84508decfcce6d2fcbe6c8c1a92.png)
您最近一年使用:0次
2018-03-07更新
|
973次组卷
|
4卷引用:甘肃省天水市第一中学2018届高三上学期第二次考试(期中)数学(文)试题
名校
5 . 如图,四棱锥P-ABCD中,PA⊥平面ABCD,底面ABCD是边长为2的正方形,
PA=AD,F为PD的中点.
(1)求证:AF⊥平面PDC;
(2)求直线AC与平面PCD所成角的大小.
您最近一年使用:0次
2016-12-03更新
|
835次组卷
|
3卷引用:2016-2017学年甘肃省天水市第一中学高一上学期期末考试数学试卷
6 . 如图,已知三棱柱
的侧棱与底面垂直,且
,
,
,
,点
、
、
分别为
、
、
的中点.
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572187350564864/1572187356684288/STEM/2120b08dc37e45db8ed78f53a06b2fbd.png)
(1)求证:
平面
;
(2)求证:
面
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f47d6a88e962cd790d2f159c021ec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/405d4e4b1755e82269bb95b1e1a44d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a3138fad69edfed47038af4d86701bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1192b3111a6dad01bba5227472bb4072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.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/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
![](https://img.xkw.com/dksih/QBM/2015/7/20/1572187350564864/1572187356684288/STEM/2120b08dc37e45db8ed78f53a06b2fbd.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc674d2604ff270dd6abc66b35e86e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de4e92d3e22221057a946fad4c5dcadf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b7903de4be7d5dc1175cfbf6e8da9f.png)
您最近一年使用:0次
7 . 如图:四棱锥
中,![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/5589988956a9465a8bfbb5b7df42b679.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/8804b1ab686147aeb37252e9a1db2e9e.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/fd0a609d3e244f11ab65be22f2fd417c.png)
(1)证明:
平面![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/00fbe8e5c7b64a148da6eacb1be0ce1c.png)
(2)在线段
上是否存在一点
,使直线
与平面
成角正弦值等于
,若存在,指出点
位置,
若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/5ea07fdc2de94741bf939d469677adbd.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/5589988956a9465a8bfbb5b7df42b679.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/8804b1ab686147aeb37252e9a1db2e9e.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/fd0a609d3e244f11ab65be22f2fd417c.png)
(1)证明:
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/55e7d2979acf4ae2b1405c0190ca7c5b.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/00fbe8e5c7b64a148da6eacb1be0ce1c.png)
(2)在线段
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/e442eec332ab440c8fa869a1f4460f8e.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/8cbee63dfc9749e48cfa2e72d6e115a9.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/d93d54cbfa5843f1b1c17e4014352ed9.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/8b0c087c85c84766a784d312195420e6.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/fd2c7e6583f14125a310341f30241496.png)
![](https://img.xkw.com/dksih/QBM/2015/3/10/1571995100471296/1571995106238464/STEM/8cbee63dfc9749e48cfa2e72d6e115a9.png)
若不存在,请说明理由.
您最近一年使用:0次