满分5 >
高中数学试题 >
为确保信息安全,信息需加密传输,发送方由明文→密文(加密),接收方由密文→明文(...
为确保信息安全,信息需加密传输,发送方由明文→密文(加密),接收方由密文→明文(解密),已知加密规则为:明文a,b,c,d对应密文a+2b,2b+c,2c+3d,4d,例如,明文1,2,3,4对应密文5,7,18,16.当接收方收到密文14,9,23,28时,则解密得到的明文为( )
A.4,6,1,7
B.7,6,1,4
C.6,4,1,7
D.1,6,4,7
考点分析:
相关试题推荐
在平行四边形ABCD是同AB=2,AD=1,∠A=60°,点M在AB边上,AM=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907005_ST/0.png)
AB,则|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907005_ST/1.png)
|等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907005_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907005_ST/3.png)
C.1
D.-1
查看答案
高三某班有60名学生(其中女生有20名),三好学生占
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907004_ST/0.png)
,而且三好学生中女生占一半,现在从该班任选一名学生参加座谈会,则在已知没有选上女生的条件下,选上的是三好学生的概率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907004_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907004_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907004_ST/3.png)
D.
查看答案
若△ABC的角A,B,C对边分别为a、b、c,且a=1,∠B=45°,S
△ABC=2,则b=( )
A.5
B.25
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907003_ST/0.png)
D.
查看答案
已知实数m是2,8的等比中项,则双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907002_ST/0.png)
的离心率为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907002_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907002_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123733327790766/SYS201310251237333277907002_ST/3.png)
D.
查看答案
已知集合M={x|y=2
x},N={x|y=lg(2x-x
2)},则M∩N=( )
A.(0,+∞)
B.(0,2)
C.(2,+∞)
D.(-∞,0)∪(2,+∞)
查看答案