名校
1 . “
”是“实系数一元二次方程
有虚根”的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c224f0b3f6788be349e1618fa4f91b82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b3a0b38f48a2c594d1129b45cc31324.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充分必要条件 | D.既不是充分条件也不是必要条件 |
您最近一年使用:0次
名校
2 . 在区间
上,
是函数
在该区间严格增的( )条件
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e105760638b22b26ff8bec4354255e4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0c72d250a079379c5175693c165248c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
A.充分不必要 | B.必要不充分 |
C.充要 | D.既不充分也不必要 |
您最近一年使用:0次
3 . 已知抛物线
的焦点为
,直线
过焦点
与该抛物线相交于
两点,
为坐标原点,则
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20ebaa32f4f1f4f807ca9aeb7fb29951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2b0ba14e41e306e5633ad4bf1cdedd8.png)
A.2 | B.3 | C.-2 | D.-3 |
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解题方法
4 . 在学习推理和证明的课堂上,王老师给出两个曲线方程
,问同学们:你想到了什么?能得到哪些结论?下列是两位同学的回答:甲:曲线
关于
对称;曲线
关于原点对称;乙:曲线
与坐标轴在第一象限围成的图形面积
;曲线
与坐标轴在第一象限围成的图形面积
.则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7284a400ead6e9eba02f326bc10564a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77f5191798242b7b9b88a75e17e4425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/585709cb7afdaa0127f466c45e42883d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e31dfce091ef8c7874d6209eef3bbb9f.png)
A.甲、乙两人都对 | B.甲、乙两人都不对; |
C.甲对,乙不对 | D.乙对,甲不对. |
您最近一年使用:0次
名校
5 . 为了研究
关于
的线性相关关系,收集了5组样本数据(见表):若已求得一元线性回归方程
,则下列选项中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8498919ac0cc8a16477beaafec83c10d.png)
1 | 2 | 3 | 4 | 5 | |
0.5 | 0.9 | 1 | 1.1 | 1.5 |
A.![]() |
B.去掉样本点![]() ![]() ![]() ![]() |
C.当![]() ![]() |
D.![]() ![]() |
您最近一年使用:0次
名校
6 . 已知
是实数,则
的一个必要非充分条件是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2128a00f52af4427721f0ebba591daa.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
真题
7 . 定义一个集合
,集合中的元素是空间内的点集,任取
,存在不全为0的实数
,使得
.已知
,则
的充分条件是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0047f659c182291c84c224df6b5e993f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5b35f6fb648951da2a58b8f7f0b1873.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/096820d860ddf8f3155bf36f5fded491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef3082f30bdeb19124814eacce2ac58f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c70219b67f6352be3d0a0400bde89d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f0e65d0421529cf42d98794b027e82.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
8 . “
”是“
”的( )条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e69866076dcff686a05e9e91e61e68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca97919cdd14506a9a6bcf3f1df553e.png)
A.充分不必要 | B.必要不充分 | C.充分必要 | D.既不充分也不必要 |
您最近一年使用:0次
名校
解题方法
9 . 设
,
,
是不全相等的实数,随机变量
取值为
,
,
的概率都是
,随机变量
取值为
,
,
的概率也都是
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e4cdd0dbc2da1b63c3718d7e4aed12f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4976036205aef7be17bd77d381735ddb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeae74ffd434af867c7a08a87259d4ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
10 . 若数列
的前
项和为
,关于正整数
的方程
记为
,命题
:对于任意的
,存在等差数列
使得
有解;命题
:对于任意的
,存在等比数列
使得
有解;则下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/159f08aed9d004e3194fb892d49c9f58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10bbdef421c976962a270a2beabbad91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
A.命题![]() ![]() | B.命题![]() ![]() |
C.命题![]() ![]() | D.命题![]() ![]() |
您最近一年使用:0次