名校
解题方法
1 . 如图,在三棱锥
中,
是边长为2的等边三角形,
,O是BC的中点,
.
![](https://img.xkw.com/dksih/QBM/2022/1/31/2906175011602432/2917176486461440/STEM/29d650b9-f1f7-4af9-b9e0-a799dc0f70a9.png?resizew=165)
(1)证明:平面
平面BCD;
(2)若三棱锥
的体积为
,E是棱AC上的一点,当
时,二面角E-BD-C大小为60°,求t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/697707aadc6eb4f2eb59c906c467283e.png)
![](https://img.xkw.com/dksih/QBM/2022/1/31/2906175011602432/2917176486461440/STEM/29d650b9-f1f7-4af9-b9e0-a799dc0f70a9.png?resizew=165)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
(2)若三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/021e6f02293d6937e4e31dfbeb0acd67.png)
您最近一年使用:0次
2022-02-15更新
|
477次组卷
|
3卷引用:辽宁省营口市2021-2022学年高二上学期期末数学试题
解题方法
2 . 已知椭圆C对称中心在原点,对称轴为坐标轴,且
,
两点.
(1)求椭圆C的方程;
(2)设M、N分别为椭圆与x轴负半轴、y轴负半轴的交点,P为椭圆上在第一象限内一点,直线PM与y轴交于点S,直线PN与x轴交于点T,求证:四边形MSTN的面积为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be91ed9d20506b2fbea3d630a6fe41e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ab7ee5bab6beb729ab04119bab02aad.png)
(1)求椭圆C的方程;
(2)设M、N分别为椭圆与x轴负半轴、y轴负半轴的交点,P为椭圆上在第一象限内一点,直线PM与y轴交于点S,直线PN与x轴交于点T,求证:四边形MSTN的面积为定值.
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解题方法
3 . 已知抛物线C:
的焦点为F,过M(4,0)的直线
交C于A、B两点,设
,
的面积分别为
、
,则
的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e55b85a1dc91ee8a026ad44e82d42b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3954beda5772eb8d5de1002ddeb81524.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb4b1ee976e8a432c739812596e036bb.png)
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名校
4 . 已知椭圆
:
与双曲线
:
有相同的焦点
、
,椭圆
的离心率为
,双曲线
的离心率为
,点P为椭圆
与双曲线
的交点,且
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1814ba64f4a9fe8d8ca8e048a33dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1799ffe432f37899f498488546fa6ec7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33558881906c228c262ff8024dcfc4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a33a99190a8fd29c36d5a002e3197cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db634c178cd7bffbd4cb886e3f2cca22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e23b61f9d46e37f82bb3e4c5a817379c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2022-02-15更新
|
1451次组卷
|
8卷引用:辽宁省营口市2021-2022学年高二上学期期末数学试题
解题方法
5 . 在直三棱柱
中,
,
,
,则异面直线
与
所成角的余弦值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df209c58c4cc146ef62100e6d3b068d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
6 . 在数列
中,令
,若对任意正整数n,
总为数列
中的项,则称数列
是“前n项之积封闭数列”,已知数列
是首项为
,公比为q的等比数列.
(1)判断:当
,q=3时,数列
是否为“前n项之积封闭数列”;
(2)证明:
是数列
为“前n项之积封闭数列”的充分不必要条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff3dc3d9f0e9180620027716e006eb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
(1)判断:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解题方法
7 . 如图,在直四棱柱
中,各棱长都为3,AC的长为
,F为棱
上一点,BF=1,连接AF,
.
![](https://img.xkw.com/dksih/QBM/2022/2/3/2908497435222016/2916968515985408/STEM/617d2d0d-a32d-4d7f-8a4a-7bf874e26114.png?resizew=137)
(1)作出平面
与底面
的交线,写出作法,并证明:平面
平面
.
(2)求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adbd3e8cf8325999cde03adf845d3dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/456175ea34492f0bc025aaab668fa659.png)
![](https://img.xkw.com/dksih/QBM/2022/2/3/2908497435222016/2916968515985408/STEM/617d2d0d-a32d-4d7f-8a4a-7bf874e26114.png?resizew=137)
(1)作出平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b4e62e036522cbbd9778e69bca4bc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac7e0a76186e549951b65b9edfa30ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2b4e62e036522cbbd9778e69bca4bc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
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解题方法
8 . 设椭圆C:
的焦点为
,
,右顶点为M,过点
斜率为k(
)的直线与椭圆C交于A,B两点,三角形
的周长为
.
(1)求椭圆的标准方程;
(2)以M为圆心,半径为
的圆与椭圆的另一个交点为
,证明:直线
过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e62a44b8712ce4483b8710cda0dc1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2c80c26a794a844127aae7dee87c93b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fddbfd748040edbd2af247bd4bebf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e2031d209711b058f3d278ede3c1d33.png)
(1)求椭圆的标准方程;
(2)以M为圆心,半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fdcbdc96eab958c3cc27c8abb1734e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b470c4e195cf7a07b7a331ce4b436e03.png)
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9 . 如图,在多面体ABCDEF中,底面ABCD是平行四边形,点G在AC上且
,
平面ABCD,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/d292c513-f7ad-4089-bc75-3a90d7d0ddc2.png?resizew=277)
(1)若H为线段DE的中点,证明:
∥平面FGD;
(2)若底面ABCD是正方形且
,线段ED上是否存在点H,使得直线CH与平面FBE所成角的正弦值为
,若存在,求
的值,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8c8a569fd51e653f0c5553c2e799b29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a22d6b860f06fe23618b0d3de6768fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2742e11fc7d28fc674537e11d09d042c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/692a092933c10e063946e4a8c31187bc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/d292c513-f7ad-4089-bc75-3a90d7d0ddc2.png?resizew=277)
(1)若H为线段DE的中点,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
(2)若底面ABCD是正方形且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25d4f801c6815e2aa2fef07d1d4c4d54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9890d1d3b36fe7fd839b39b1c20400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9e2651a62aba983ee244c483bbd903.png)
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