1 . 已知抛物线
,过点
引一条弦
使它恰好被点
平分,求这条弦所在的直线方程及
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0261104a7c308433a0c0508ff20ea29a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2e78b598367578143d0495b51f0c04f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4a949c00526fddf435423272cf10f25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4c46a4c3494f3b1899208b16de9b2d.png)
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名校
2 . 命题“
,
”的否定是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1634811a5cb91545c19e2582a92bda5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243e64f57929cede555b88a0782c0b2f.png)
A.存在![]() ![]() | B.不存在![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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名校
3 . 命题“
,
”的否定是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c780149aef1bd77162e85f7f8906a6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ddc527fdf894b6c558a1936592d33b1.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
您最近一年使用:0次
2016-12-03更新
|
355次组卷
|
2卷引用:2015届湖南省株洲市高三教学质量统一检测一文科数学试卷
2012·福建漳州·一模
4 . 下列有关命题的说法正确的是
A.命题“若![]() ![]() ![]() ![]() |
B.“![]() |
C.命题“![]() ![]() ![]() ![]() |
D.命题“若![]() ![]() |
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5 . 设
,集合
是奇数集,集合
是偶数集.若命题
,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c9603add492c15b3d796dfc24ca9a6.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/4fece1c99e9ee75cbac4beb31ad6abc0.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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2014·全国·一模
6 . 双曲线
=1(m>0,n>0)的离心率为2,有一个焦点与抛物线y2=4mx的焦点重合,则n的值为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/119e30c0151cdc24e445e6781414d779.png)
A.1 | B.4 | C.8 | D.12 |
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7 . 下列语句:
①“
”是“
”的充分不必要条件.
②“x=2时,x2-3x+2=0”的否命题为真命题.
③命题“
使得
”的否定是:“
均有
”.
④命题“若
,则
”的逆否命题为真命题.其中说法错误的是_________ .
①“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bad6987e8abfbf07d6a2650483d2a55.png)
![](https://img.xkw.com/dksih/QBM/2016/1/27/1572469086756864/1572469092163584/STEM/1b8ea986ad66495f91995d7b31bb6461.png?resizew=36)
②“x=2时,x2-3x+2=0”的否命题为真命题.
③命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20551b4d2f41854efab337dc6641d95b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264dab145ceba44696a6ee63b1e1549d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7be60375c36c501a8438384f4afb3034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/264dab145ceba44696a6ee63b1e1549d.png)
④命题“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07b9d5aaaceaa3ac514d17fcfefbf9b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce22028b0472ba0c4db9c3179e963ad2.png)
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9-10高二下·浙江温州·期末
8 . 在△ABC中,“
”是“
”的
![](https://img.xkw.com/dksih/QBM/2011/12/19/1570623823470592/1570623828770816/STEM/807eff5cc1734a2ba5b4cf367a50e195.png)
![](https://img.xkw.com/dksih/QBM/2011/12/19/1570623823470592/1570623828770816/STEM/4005242d6b144e42a2522fa1b025080e.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 |
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解题方法
9 . 如图,四棱锥P-ABCD中,底面
为菱形,且
,
.
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572416810254336/1572416815480832/STEM/2d8d521c946043cca8f9351e977f4c78.png)
(Ⅰ)求证:
;
(Ⅱ)若
,求二面角
的余弦值.
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572416810254336/1572416815480832/STEM/199e16944b6648aea3143f6313025159.png)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572416810254336/1572416815480832/STEM/afeca95e445b4c569621f2ae553b6fdb.png)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572416810254336/1572416815480832/STEM/dddeb896e31046f4b355ee8b357fcdfc.png)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572416810254336/1572416815480832/STEM/2d8d521c946043cca8f9351e977f4c78.png)
(Ⅰ)求证:
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572416810254336/1572416815480832/STEM/4c79bb0354194d16a5fd99d4abf4e250.png)
(Ⅱ)若
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572416810254336/1572416815480832/STEM/0e37c858ce1b44aeb619047fd57ea3f4.png)
![](https://img.xkw.com/dksih/QBM/2016/1/5/1572416810254336/1572416815480832/STEM/0142a1ec9fc5441cbba692c694f7a0a9.png)
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10 . “0<a<4”是“命题‘∀x∈R,不等式x2+ax+a≥0成立’为真命题”的
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
2016-12-03更新
|
968次组卷
|
4卷引用:2016届湖南省株洲市二中高三上学期期中理科数学试卷