名校
1 . 在下列命题中
①函数f(x)=![](https://img.xkw.com/dksih/QBM/2017/9/12/1779404213936128/1790884842864640/STEM/b180ff2b605049439224b1b28b896b2a.png?resizew=13)
在定义域内为单调递减函数;
②已知定义在R上周期为4的函数f(x)满足f(2﹣x)=f(2+x),则f(x)一定为偶函数;
③若f(x)为奇函数,则
f(x)dx=
2f(x)dx(a>0);
④已知函数f(x)=ax3+bx2+cx+d(a≠0),则a+b+c=0是f(x)有极值的充分不必要条件;
⑤已知函数f(x)=x﹣sinx,若a+b>0,则f(a)+f(b)>0.
其中正确命题的序号为________ (写出所有正确命题的序号).
①函数f(x)=
![](https://img.xkw.com/dksih/QBM/2017/9/12/1779404213936128/1790884842864640/STEM/b180ff2b605049439224b1b28b896b2a.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2017/9/12/1779404213936128/1790884842864640/STEM/76e41186ce9a4e57a25bd90290345d42.png?resizew=13)
②已知定义在R上周期为4的函数f(x)满足f(2﹣x)=f(2+x),则f(x)一定为偶函数;
③若f(x)为奇函数,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf1afb94a2b6192ff8384ca799f395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c65e406ef0b179ee713a87ced7d5606d.png)
④已知函数f(x)=ax3+bx2+cx+d(a≠0),则a+b+c=0是f(x)有极值的充分不必要条件;
⑤已知函数f(x)=x﹣sinx,若a+b>0,则f(a)+f(b)>0.
其中正确命题的序号为
您最近一年使用:0次
2017-10-08更新
|
374次组卷
|
4卷引用:安徽省黄山市屯溪第一中学2016-2017学年高二下学期期中考试数学(理)试题1
11-12高二下·安徽安庆·期中
2 . 在吸烟与患肺癌这两个分类变量的独立性检验的计算中,下列说法正确的是( )
A.若![]() ![]() ![]() |
B.由独立性检验可知,在犯错误的概率不超过![]() ![]() |
C.若从统计量中求出在犯错误的概率不超过![]() ![]() |
D.以上三种说法都不正确. |
您最近一年使用:0次
3 . 已知函数f(x)=sin(x﹣α)+2cosx,(其中α为常数),给出下列五个命题:
①存在α,使函数f(x)为偶函数;
②存在α,使函数f(x)为奇函数;
③函数f(x)的最小值为﹣3;
④若函数f(x)的最大值为h(α),则h(α)的最大值为3;
⑤当α=
时,(﹣
,0)是函数f(x)的一个对称中心.
其中正确的命题序号为_____ (把所有正确命题的选号都填上)
①存在α,使函数f(x)为偶函数;
②存在α,使函数f(x)为奇函数;
③函数f(x)的最小值为﹣3;
④若函数f(x)的最大值为h(α),则h(α)的最大值为3;
⑤当α=
![](https://img.xkw.com/dksih/QBM/2016/3/16/1572540707856384/1572540713852928/STEM/b9b8ed033a9f485780b4be4499c14aa3.png?resizew=18)
![](https://img.xkw.com/dksih/QBM/2016/3/16/1572540707856384/1572540713852928/STEM/67551cac1d614b3a84562e7038cad70b.png?resizew=18)
其中正确的命题序号为
您最近一年使用:0次
4 . 下列判断:
(1)从个体编号为
,
,…,
的总体中抽取一个容量为
的样本,若采用系统抽样方法进行抽取,则分段间隔应为
;
(2)已知某种彩票的中奖概率为
,那么买
张这种彩票就一定会中奖(假设该彩票有足够的张数);
(3)从装有
个红球和
个黑球的口袋内任取
个球,恰有
个黑球与恰有
个黑球是互斥但不对立的两个事件;
(4)设具有线性相关关系的变量的一组数据是(
,
),(
,
),(
,
),(
,
),则它们的回归直线一定过点(
,
).
其中正确的序号是
(1)从个体编号为
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/255eab5201f14a26844fc69b30dc873b.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/20989dae5c384442bdd9b1df112269d3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/dee47512b3f14bc79f3c050a93aecec9.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/551afda1948748a59b0ff298f977584c.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/454a61332bf7431a863ec14a311cdff6.png)
(2)已知某种彩票的中奖概率为
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/b613c6e2751f49ecac795245a2c496cc.png?resizew=37)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/dee47512b3f14bc79f3c050a93aecec9.png)
(3)从装有
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/20989dae5c384442bdd9b1df112269d3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/20989dae5c384442bdd9b1df112269d3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/20989dae5c384442bdd9b1df112269d3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/255eab5201f14a26844fc69b30dc873b.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/20989dae5c384442bdd9b1df112269d3.png)
(4)设具有线性相关关系的变量的一组数据是(
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/255eab5201f14a26844fc69b30dc873b.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/99962cef09ef462f9fdf63a3c8f81d03.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/20989dae5c384442bdd9b1df112269d3.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/485155e39d814941a8654ac8d72c18f0.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/99962cef09ef462f9fdf63a3c8f81d03.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/1a60de75c7d3475eb0a7197f33c00de8.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/1a60de75c7d3475eb0a7197f33c00de8.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/cc76992347824fbe86d372db7d2de37a.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/99962cef09ef462f9fdf63a3c8f81d03.png)
![](https://img.xkw.com/dksih/QBM/2016/10/11/1573064567373824/1573064573419520/STEM/b96b97b1e8544b83bcbc864e745682c0.png)
其中正确的序号是
A.(![]() ![]() ![]() | B.(![]() ![]() ![]() |
C.(![]() ![]() | D.(![]() ![]() |
您最近一年使用:0次
10-11高二下·河南郑州·期末
5 . 某医疗研究所为了检验某种血清预防感冒的作用,把
名使用血清的人与另外
名未用血清的人一年中的感冒记录作比较,提出假设
:“这种血清不能起到预防感冒的作用”,利用
列联表计算得
,经查对临界值表知
.对此,四名同学做出了以下的判断:
:有
的把握认为“这种血清能起到预防感冒的作用”
:若某人未使用该血清,那么他在一年中有
的可能性得感冒
:这种血清预防感冒的有效率为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b399e6815afcaa24f2889e58c79c10a1.png)
:这种血清预防感冒的有效率为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e6f66f9e4e2a49a0db2489894e9d97.png)
则下列结论中,正确结论的序号是
①
; ②
; ③
; ④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821b8672d030c240ff230a0174aa7a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/821b8672d030c240ff230a0174aa7a3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e6889f68ad87503b2701245c10a1c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b72fcdc709e77910cd36a26369648b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c77f1ccccd5ed0722e85662121fb2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a93888a85455e51d2f0d21e34263d7b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b399e6815afcaa24f2889e58c79c10a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b399e6815afcaa24f2889e58c79c10a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b399e6815afcaa24f2889e58c79c10a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e6f66f9e4e2a49a0db2489894e9d97.png)
则下列结论中,正确结论的序号是
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97842fd0ea2ea493566e5b4e363daa5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abb9d57cbe246df4aa7b2e12e4aed9ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2a13a3d79276f22cec9a68f45a0e41f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f1970f59d932385059964c1b160cec.png)
您最近一年使用:0次
11-12高二下·安徽黄山·期中
解题方法
6 . 已知点
与点
在直线
的两侧,则下列说法
①
; ②
时,
有最小值,无最大值;
③
恒成立;
④ 当![](https://img.xkw.com/dksih/QBM/2012/1/6/1570680900141056/1570680905105408/STEM/c3f9b6342f654e3cb61660a2628aef14.png?resizew=48)
,
, 则
的取值范围为(-
;
其中正确的命题是___________ (填上正确命题的序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827539d066d1b78e7ef8bc1569864971.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5040486db9bff0e394a61fe4f0b7bd86.png)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570680900141056/1570680905105408/STEM/918ddd300b1a42fd9656d6db0c0fdc7e.png?resizew=99)
①
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570680900141056/1570680905105408/STEM/17751645d7de400d96c4e7c35669305f.png?resizew=97)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570680900141056/1570680905105408/STEM/6d01309cb8cb4d0aa6f4497ecb46491d.png?resizew=34)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570680900141056/1570680905105408/STEM/013ebff07edc4b50b2a19980baa8e816.png?resizew=16)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ba2ba5648516e6c70140233569b50c7.png)
④ 当
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570680900141056/1570680905105408/STEM/c3f9b6342f654e3cb61660a2628aef14.png?resizew=48)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570680900141056/1570680905105408/STEM/87e6eea667b44cf88b0a614ee2262093.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570680900141056/1570680905105408/STEM/c13313b34cb14e3ba1a0349ba3ce9a28.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2012/1/6/1570680900141056/1570680905105408/STEM/4ec47045ea864808854354ec1421b070.png?resizew=34)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8e3b9854242982c19622b9d9b63133b.png)
其中正确的命题是
您最近一年使用:0次