1 . 已知集合
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25a858053170d9281e40f6ebc9884deb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d4ed9478aa5f8da5a71ecee13ef7dd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4b9b470218359a4a47be9244980489e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2 . 已知直三棱柱
中,侧面
为正方形,
,E,F分别为AC和
的中点,D为棱
上的点,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/ec63c8b9-2ce5-4713-acaa-03b0c8d15684.png?resizew=135)
(1)求证:
:
(2)当
时,求平面
与平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f121eabff3c62c1a196d9ca5f6f83f0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0023280949eda97787964f0a9d41ed2e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/ec63c8b9-2ce5-4713-acaa-03b0c8d15684.png?resizew=135)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a7a3dc3f3a02f4400e22dec2f2fee23.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97685285fc594a91098e09b0374b17c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
您最近一年使用:0次
解题方法
3 . 设双曲线C:
(
,
)的右焦点为F,点O为坐标原点,过点F的直线
与C的右支相交于A,B两点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/1e8e31f1-e40d-4c06-b771-0bac1138391c.png?resizew=147)
(1)当直线
与x轴垂直,且
两点的距离等于双曲线C的实轴长时,求双曲线C的离心率;
(2)若双曲线C的焦距为4,且
恒成立,求双曲线C的实轴长的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f3fa0b40fb0d9b8c62e37316ab3b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/1e8e31f1-e40d-4c06-b771-0bac1138391c.png?resizew=147)
(1)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(2)若双曲线C的焦距为4,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c22b86f2cc5dc2f8053711f932a57f9.png)
您最近一年使用:0次
4 . 在正方体
中,点E,F满足
,
,且x,y,
.记EF与
所成角为
,
与平面ABCD所成角为
,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/ad809071-0a0d-48bd-afbd-9a590790bb88.png?resizew=165)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0851e4d9e17780514c42382d51fa0ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111489883a7ab93157a566ab86c89db2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a36be0318740b62e478be084bd837a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/ad809071-0a0d-48bd-afbd-9a590790bb88.png?resizew=165)
A.若![]() |
B.若![]() ![]() |
C.![]() ![]() |
D.![]() ![]() ![]() ![]() |
您最近一年使用:0次
解题方法
5 . 已知
,
分别是椭圆
(
)的左,右焦点,椭圆上一点P满足
,且
,则该椭圆的离心率等于( )
![](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/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2427943a38dcd93c9ec9b735ffc9fe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79e2401537850d6b2e6f3aeedc4acc3e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
6 . 已知圆O:
,直线
.
(1)若直线l与圆O交于不同的两点A,B,当
时,求k的值;
(2)若
时,点P为直线l上的动点,过点P作圆O的两条切线PC,PD,切点分别为C,D,求四边形
的面积的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f5d967ad135991b6075ee45df55643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b775e4e52620e32f713a0326776c842b.png)
(1)若直线l与圆O交于不同的两点A,B,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ccc37b189fa2cbc269ca0b233dac37.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a2a34b4317deffa40ba34e269c2b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/033274547930b2e2dcd4ea4919a36738.png)
您最近一年使用:0次
解题方法
7 . 已知函数
是定义在R上的奇函数,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb80007983e5b99dcdeebf87d18ff4.png)
A.![]() |
B.![]() |
C.若![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() ![]() ![]() |
您最近一年使用:0次
解题方法
8 . 已知
为等差数列
的前n项和,若
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5eb9b8f893dd71876349ad40724550.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae2e6956e0073cef684fef6a16bead0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde13a1d82174255f34cc22f8127787b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f5eb9b8f893dd71876349ad40724550.png)
您最近一年使用:0次
解题方法
9 . 已知等比数列
的公比
,且
,
是
,
的等差中项.数列
满足
,数列
的前n项和等于
.
(1)求数列
的前n项和
;
(2)求数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eda6dc559d07bc22c9a0ed1e3a6d01d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3104915bee1cc61f9db3e6dbff6a095.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/310ed4bbdf24e0803b4b2adbacddec12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daf464629fa321a6ff7401ab79f07083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd6c97d2ee3e74ba5730f1cbcc1d43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b1e8d1e12e11850958dd8cd1f320dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ceef1abeeef220b4fe5f7d96feedd90.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
您最近一年使用:0次
10 . 双曲线
的渐近线方程是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760a793ad8dadeba59aef81106e95288.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次