1 . 若复数z=
(
)为纯虚数,则z的共轭复数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64b789c4982f08f1245e8357cbcaa610.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
A.-2i | B.i | C.-i | D.2i |
您最近一年使用:0次
名校
2 . 下列说法正确的是( )
A.一组数据的标准差为![]() | ||||||||||
B.两组数据的标准差相等,则这两组数据的平均数相等 | ||||||||||
C.若两个变量的相关系数越接近于![]() | ||||||||||
D.已知变量![]() ![]() ![]() ![]() ![]() ![]() |
您最近一年使用:0次
名校
3 . 复数
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925e10bbdeceb66b666d4fc5c84d32f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9c3d509e77d6a7e4874302308c2aba.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
4 . 若复数z的实部和虚部均为整数,则称复数z为高斯整数,关于高斯整数,有下列命题:①整数都是高斯整数;②两个高斯整数的乘积也是高斯整数;③模为3的非纯虚数可能是高斯整数.其中正确的命题有( )
A.①② | B.①③ | C.②③ | D.①②③ |
您最近一年使用:0次
12-13高二下·江苏扬州·期中
名校
5 . 观察下列式子:
,根据以上式子可以猜想:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafa45fd7c4fc4e180951d1713a64b5f.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3c20c4e23a9ef24cb8cba2a89c8b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dafa45fd7c4fc4e180951d1713a64b5f.png)
您最近一年使用:0次
6 . 执行如图所示的程序框图,则输出的S=
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572548471308288/1572548476542976/STEM/aaec45e4736e4637bbd05d6ba22fe902.png)
![](https://img.xkw.com/dksih/QBM/2016/3/21/1572548471308288/1572548476542976/STEM/aaec45e4736e4637bbd05d6ba22fe902.png)
A.1023 | B.512 | C.511 | D.255 |
您最近一年使用:0次
9-10高二下·河南鹤壁·阶段练习
7 . 若数列{![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/f4bc3b13d8ba47e49a81582b40c817eb.png?resizew=13)
},(n∈N
)是等差数列,则有数列b
=
(n∈N
)也是等差数列,类比上述性质,相应地:若数列{c
}是等比数列,且c
>0(n∈N
),则有d
="________ " (n∈N
)也是等比数列.
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/f4bc3b13d8ba47e49a81582b40c817eb.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/414941709e5c4199a2d780a0d64d6a90.png?resizew=11)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/47818d76f20a440c8f3ba951fc522a35.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/414941709e5c4199a2d780a0d64d6a90.png?resizew=11)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/e90e7c5618574cd99cf5fd09554b0c98.png?resizew=108)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/47818d76f20a440c8f3ba951fc522a35.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/414941709e5c4199a2d780a0d64d6a90.png?resizew=11)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/414941709e5c4199a2d780a0d64d6a90.png?resizew=11)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/47818d76f20a440c8f3ba951fc522a35.png?resizew=9)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/414941709e5c4199a2d780a0d64d6a90.png?resizew=11)
![](https://img.xkw.com/dksih/QBM/2016/7/18/1572925736148992/1572925742006272/STEM/47818d76f20a440c8f3ba951fc522a35.png?resizew=9)
您最近一年使用:0次
2016-11-30更新
|
600次组卷
|
7卷引用:2015届陕西西安铁一中学国际合作校高三下第一练文科数学卷
2015届陕西西安铁一中学国际合作校高三下第一练文科数学卷(已下线)2011届福建省厦门市杏南中学中学高三12月月考数学文卷(已下线)2010年河南省鹤壁市高二下学期第一次段考数学试题(已下线)大连市第23中2009-2010学年度高二下学期期中考试(理科)(已下线)福建师大附中2009-2010学年第二学期期中考试卷高二数学理科选修2-2(已下线)2012-2013学年福建省晋江市季延中学高二下学期期中考试文科数学试卷2015-2016学年安徽省池州市东至二中高二4月月考文科数学试卷
12-13高三·天津·阶段练习
8 . 执行如图所示的算法框图,则输出的
值是( ).
![](https://img.xkw.com/dksih/QBM/2018/3/14/1902059772600320/1902839876960256/STEM/f295a9962f524e098200907ecd8345d6.png?resizew=193)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/2018/3/14/1902059772600320/1902839876960256/STEM/f295a9962f524e098200907ecd8345d6.png?resizew=193)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2013-03-08更新
|
1121次组卷
|
3卷引用:陕西省渭南市2018届高三教学质量检测(I)理科数学试题
9 . 观察下面算式:
;
;
;
;
…………
,其中
,那么![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/430b424bdc195b1dab036779fb956b72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/232f4299d55ea79adf3222d779cc41c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f07dba6451511827fbd4d402e88b71ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c598718b4dd2fa6bec75bddcf52c2c45.png)
…………
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/522751e8c50fd5a3ae483faa4fbf4085.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd5889863c33a3a7a79c08a86b58ed51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999465d0e871febde66296a0cbf058c.png)
您最近一年使用:0次
2016-12-03更新
|
389次组卷
|
2卷引用:2015届陕西省西安市曲江一中高三上学期期中考试理科数学试卷
10 . 如果执行如图所示的框图,输入
,则输出的数
等于
![](https://img.xkw.com/dksih/QBM/2016/9/1/1572995558965248/1572995564675072/STEM/5922db70f59b47b3bb63ca0e66585fac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebcc133d5b11b33a904875182d8c8261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://img.xkw.com/dksih/QBM/2016/9/1/1572995558965248/1572995564675072/STEM/5922db70f59b47b3bb63ca0e66585fac.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次