1 . 对于复数
,给出下列三个运算式子:(1)
,(2)
,(3)
.其中正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e151e8b8eaea50ecee04a34fdbd3d54d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a100d401d78914e89031d187db644c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f820bec05622a88778dab1db916c50f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48d089759ffea1b2484ec1fe3e0ec41.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 在复数运算中下列三个式子是正确的:(1)
;(2)
;(3)
,相应的在向量运算中,下列式子:(1)
;(2)
;(3)
,正确的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45a6cf67ff73af179c3d5c62e6ac726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/056981f23c5183f14b398312bdce67fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48d089759ffea1b2484ec1fe3e0ec41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e16eb8b024d622004f45b03e2e9d10d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9fdfe80717e6aea40111917dfce9b07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a193ad58626f5de498e41d907bf0e8.png)
A.0 | B.1 | C.2 | D.3 |
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2018-04-23更新
|
245次组卷
|
2卷引用:上海市浦东新区2018届高三下学期教学质量检测(二模)数学试题
3 . 若对任意
,都有
=a0+a1x+a2x2+…+anxn+…,则
的值等于.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66762d16d8f27a620ecc219df93e7d06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b04dd2a53c1d919bda41420548127e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f9d2e152db0845ff23e4ea0cd00974d.png)
A.3 | B.2 | C.1 | D.![]() |
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4 . 记方程①x2+a1x+1=0,②x2+a2x+1=0,③x2+a3x+1=0,其中a1,a2,a3是正实数,当a1,a2,a3成等比数列,下列选项中,当方程③有实根时,能推出的是
A.方程①有实根或方程②无实根 | B.方程①有实根或方程②有实根 |
C.方程①无实根或方程②无实根 | D.方程①无实根或方程②有实根 |
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2016-12-04更新
|
476次组卷
|
2卷引用:2016届上海市建平中学高三上12月月考理科数学试卷
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5 . 若把正整数按图所示的规律排序,则从2002到2004年的箭头方向依次为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925d7eedf71470d86b991ebdcf6e11a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925d7eedf71470d86b991ebdcf6e11a6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2016-12-03更新
|
590次组卷
|
2卷引用:2014-2015学年上海市彭浦中学高二上学期第一次月考数学试卷
13-14高二下·四川资阳·期末
名校
6 . 若数列{an}是等比数列,且an>0,则数列
也是等比数列. 若数列
是等差数列,可类比得到关于等差数列的一个性质为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e118e945da6137cad10fc17337e4a886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d737c1047a14cee12a6671383e244fa5.png)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
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13-14高三上·广东珠海·阶段练习
7 . 如图:正方体
,棱长为1,黑白二蚁都从点
出发,沿棱向前爬行,每走一条棱称为“走完一段”.白蚁爬行的路线是
黑蚁爬行的路线是
它们都遵循如下规则:所爬行的第
段所在直线与第
段所在直线必须是异面直线(其中
).设黑白二蚁走完第2014段后,各停止在正方体的某个顶点处,这时黑白蚁的距离是
![](https://img.xkw.com/dksih/QBM/2013/11/8/1571385991315456/1571385996869632/STEM/037b96351e8d4e32a418a1aea8dc18f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8456cee87c4e22351affc28f3a73a0f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edb1f874648f697dec149afdcf77a0e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b076bb55f4d1eb99fe83a0ecc3589899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03bed55fdfdf5a819bbf7bdebcbbc3d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e477e4eb7f4c9fedba2c674cbd8cc1d7.png)
![](https://img.xkw.com/dksih/QBM/2013/11/8/1571385991315456/1571385996869632/STEM/037b96351e8d4e32a418a1aea8dc18f8.png)
A.1 | B.![]() | C.![]() | D.0 |
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2011·上海静安·一模
8 . 已知有穷数列A:
(
).定义如下操作过程T:从A中任取两项
,将
的值添在A的最后,然后删除
,这样得到一系列
项的新数列A1(约定:一个数也视作数列);对A1的所有可能结果重复操作过程T又得到一系列
项的新数列A2,如此经过
次操作后得到的新数列记作Ak .设A:
,则A3的可能结果是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9304e71a623c4412188a800046a970d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ea88016f672b8f54901e457cceecca1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/744e4fbdb7be6d63b59aa4a4c3507241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/722ef4fd11432444fddac6679a35b8b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/744e4fbdb7be6d63b59aa4a4c3507241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aadf9ab510510120699c5eee39ab18b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a1271285428c740905f7d5db68c5dc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c72c76d5b423c14dfc37a3a1aff2aa.png)
A.0 | B.![]() | C.![]() | D.![]() |
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9 . 数0,1,2,3,4,5,…按以下规律排列:
…,则从2013到2016四数之间的位置图形为( )
![](https://img.xkw.com/dksih/QBM/2016/3/9/1572528012312576/1572528018112512/STEM/2cc2bcd76a71484c8b11f3f1a24ebd87.png?resizew=162)
A.![]() | B.![]() | C.![]() | D.![]() |
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