1 . 已知
,“
”是“
”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73254f32b6da29ecc32df2e9f87a4c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3019b662e5dc2750bb6f9199d3250f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e03b355737a5cb03c1ffa5453c34ce7.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
2 . 已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a688ae19f0ba567b84c65f0ae3e453c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bef08121d08759751fba0d168c7f3737.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
3 . 在平面直角坐标系
中,椭圆
:
的右焦点为
,y轴右侧的两点A,B在椭圆
上,且直线AB与圆O:
相切,若椭圆
的焦距为12,
的周长为15,则椭圆
的离心率为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/347b68f42934c74e0d759a67613a1da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef74c4299221a967507c6a179337581a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
4 . 曲线
在点
,
处的切线分别与y轴交于点
,
.若c,
,d成等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b9afe6e2307c6a8b0097a6c45b227c.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12be206d66e65eb92ef08bad8cd8f71d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ef0106bb3ce17e344936f77a6b7eb88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc3a0cacfbe43771f3b89e4bec4d7ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/541130d07517bebaee5f5577fe167023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44853242539b71cc7c54ef06c3a713fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d90ab6e95bc1e1b06fd5aa3b7d2b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32b9afe6e2307c6a8b0097a6c45b227c.png)
您最近一年使用:0次
解题方法
5 . 某品牌儿童玩具一箱80件,每箱玩具在出厂前都需要经过质检,如果质检不合格,则立即更换.质检时,先从一箱玩具中任取8件检验,再根据检验结果决定是否对余下的所有玩具进行检验,设每件玩具质检不合格的概率都为
,且各件玩具质检是否合格相互独立.
(1)若
,求8件玩具中至少有一件质检不合格的概率;
(2)记8件玩具中恰有2件质检不合格的概率为
,求
的极大值点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c8578f06897aa6fb84aa95c797d3d8.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f970f380a12c843bb4a74ff34a15b2ac.png)
(2)记8件玩具中恰有2件质检不合格的概率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1f109f79547d6ae0d94339e689e8f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1f109f79547d6ae0d94339e689e8f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3606c4a853a6a34cb7f33bea81b15a1f.png)
您最近一年使用:0次
6 . 已知
,
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e8bd61242e64da90ad2e501c0b5d5fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f84694e86e7649bd2a8b4eb439f9c82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27c8dca5aaf37c077dde6eccfb5f3c4a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
7 . 复数p,q,r在复平面内对应的点分别为P,Q,R,下列说法正确的有( )
A.若![]() ![]() | B.若![]() ![]() |
C.若![]() | D.若![]() ![]() ![]() ![]() |
您最近一年使用:0次
8 . 设函数
的导函数为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71f703efb8a4f0587423779ba1fd5f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9feb76cccfec6a2f9656f7c0bea671f6.png)
A.![]() | B.![]() | C.7 | D.25 |
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解题方法
9 . 已知
为
的三条边长,则下列结论正确的有( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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10 . 函数
的定义域为R,对于任意实数x,y,都有
,则
的值不可能是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82bde53de43dda74249725823c0e6610.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ce6155e181e21ce56ea658b70f8af17.png)
A.-2 | B.![]() | C.1 | D.2 |
您最近一年使用:0次