已知点G是△ABO的重心,M是AB边的中点.且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041020_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041020_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041020_ST/2.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041020_ST/3.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041020_ST/4.png)
=m
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041020_ST/5.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041020_ST/6.png)
=n
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041020_ST/7.png)
,求证:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041020_ST/8.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041020_ST/9.png)
=3.
考点分析:
相关试题推荐
函数f(x)=lnx-ax(a>0).
(1)当a=2时,求f(x)的单调区间与极值;
(2)对∀x∈(0,+∞),f(x)<0恒成立,求实数a的范围.
查看答案
在平面直角坐标系xOy中,点A(-1,-2)、B(2,3)、C(-2,-1).
(1)求以线段AB、AC为邻边的平行四边形两条对角线的长;
(2)设实数t满足(
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041018_ST/0.png)
)•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041018_ST/1.png)
=0,求t的值.
查看答案
设定义在(0,+∞)上的函数f(x)=ax+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041017_ST/0.png)
+b(a>0)
(Ⅰ)求f(x)的最小值;
(Ⅱ)若曲线y=f(x)在点(1,f(1))处的切线方程为y=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041017_ST/1.png)
,求a,b的值.
查看答案
在△ABC中,角A、B、C所对的边分别为a、b、c,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041016_ST/0.png)
.
(Ⅰ)求
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041016_ST/1.png)
的值;
(Ⅱ)若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041016_ST/2.png)
,求bc的最大值.
查看答案
已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041015_ST/0.png)
=-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041015_ST/1.png)
.
(1)求tanα的值;
(2)若β为第二象限的角,且tan(α-β)=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102328041104106/SYS201311031023280411041015_ST/2.png)
,求β.
查看答案