log220-log25+log34•log43= .
考点分析:
相关试题推荐
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736019_ST/0.png)
的定义域为F,函数y=lg(x-1)+lg(x-2)的定义域为G,那么F∩G=
.
查看答案
在直角坐标系xOy中,已知点A(-2,0),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736018_ST/0.png)
,C(2cosθ,sinθ),其中
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736018_ST/1.png)
.
(1)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736018_ST/2.png)
,求tanθ的值;
(2)设点D(1,0),求
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736018_ST/3.png)
的最大值;
(3)设点E(a,0),a∈R,将
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736018_ST/4.png)
表示成θ的函数,记其最小值为f(a),求f(a)的表达式,并求f(a)的最大值.
查看答案
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736017_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736017_ST/1.png)
.
(1)求tanα的值;
(2)求
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736017_ST/2.png)
的值.
查看答案
已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736016_ST/0.png)
、
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736016_ST/1.png)
满足|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736016_ST/2.png)
|=|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736016_ST/3.png)
|=1,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736016_ST/4.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736016_ST/5.png)
的夹角为60°.
(1)求
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736016_ST/6.png)
;
(2)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736016_ST/7.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736016_ST/8.png)
+λ
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736016_ST/9.png)
垂直,求实数λ的值.
查看答案
如图,圆O的半径为2,l为圆O外一条直线,圆心O到直线l的距离|OA|=3,P
为圆周上一点,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225056287273661/SYS201311012250562872736015_ST/0.png)
,点P从P
处开始以2秒一周的速度绕点O在圆周上按逆时针方向作匀速圆周运动.
①1秒钟后,点P的横坐标为
;
②t秒钟后,点P到直线l的距离用t可以表示为
.
查看答案