满分5 >
高中数学试题 >
下列各式中,值不为的是( ) A.cos215°-sin215° B.sin45...
下列各式中,值不为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176769748/SYS201310241830141767697002_ST/0.png)
的是( )
A.cos
215°-sin
215°
B.sin45°cos15°+cos45°sin15°
C.cos25°cos5°+sin25°sin5°
D.cos25°cos5°-sin25°sin5°
考点分析:
相关试题推荐
如图,平面内的两条相交直线OP
1和OP
2将该平面分割成四个部分I、II、III、Ⅳ(不包含边界).设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176769748/SYS201310241830141767697001_ST/0.png)
=m
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176769748/SYS201310241830141767697001_ST/1.png)
+n
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176769748/SYS201310241830141767697001_ST/2.png)
,且点P落在第III部分,则实数m,n满足( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176769748/SYS201310241830141767697001_ST/images3.png)
A.m>0,n>0
B.m>0,n<0
C.m<0,n<0
D.m<0,n<0
查看答案
设复数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176769748/SYS201310241830141767697000_ST/0.png)
,则1+w=( )
A.w
B.-w
C.w
2D.-w
2
查看答案
已知集合M是满足下列性质的函数f(x)的全体:在定义域内存在x
,使得f(x
+1)=f(x
)+f(1)成立.
(1)函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176765348/SYS201310241830141767653019_ST/0.png)
是否属于集合M?说明理由;
(2)设函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176765348/SYS201310241830141767653019_ST/1.png)
,求a的取值范围;
(3)设函数y=2
x图象与函数y=-x的图象有交点,证明:函数f(x)=2
x+x
2∈M.
查看答案
已知一列非零向
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176765348/SYS201310241830141767653018_ST/0.png)
.
(Ⅰ)证明:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176765348/SYS201310241830141767653018_ST/1.png)
是等比数列;
(Ⅱ)求向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176765348/SYS201310241830141767653018_ST/2.png)
;
(Ⅲ)设
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176765348/SYS201310241830141767653018_ST/3.png)
一列,记为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176765348/SYS201310241830141767653018_ST/4.png)
为坐标原点,求点列{B
n}的极限点B的坐标.
(注:若点B
n坐标为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176765348/SYS201310241830141767653018_ST/5.png)
的极限点.)
查看答案
某房地产开发公司计划在一楼区内建造一个长方形公园ABCD,公园由长方形的休闲区A
1B
1C
1D
1和环公园人行道(阴影部分)组成.已知休闲区A
1B
1C
1D
1的面积为4000平方米,人行道的宽分别为4米和10米(如图)
(Ⅰ)若设休闲区的长和宽的比
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183014176765348/SYS201310241830141767653017_ST/0.png)
,求公园ABCD所占面积S关于x的函数S(x)的解析式;
(Ⅱ)要使公园所占面积最小,休闲区A
1B
1C
1D
1的长和宽该如何设计?
查看答案