已知两定点A(-4,0)、B(4,0),一动点P(x,y)与两定点A、B的连线PA、PB的斜率的乘积为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211843116150172/SYS201310232118431161501005_ST/0.png)
,求点P的轨迹方程,并把它化为标准方程,指出是什么曲线.
考点分析:
相关试题推荐
解不等式
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211843116150172/SYS201310232118431161501004_ST/0.png)
并在数轴上把它的解表示出来.
查看答案
正六棱锥V-ABCDEF的高为2cm,底面边长为2cm.
(1)按1:1画出它的三视图;
(2)求其侧面积;
(3)求它的侧棱和底面的夹角.
查看答案
已知圆A的直径为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211843116150172/SYS201310232118431161501002_ST/0.png)
,圆B的直径为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211843116150172/SYS201310232118431161501002_ST/1.png)
,圆C的直径为2,圆A与圆B外切,圆A又与圆C外切∠A=60°,求BC及∠C.
查看答案
在△ABC中,∠C的平分线交AB于D,过D作BC的平分线交AC于E,已知BC=a,AC=b,求DE的长.
查看答案
(1)化简
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211843116150172/SYS201310232118431161501000_ST/0.png)
;
(2)计算
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211843116150172/SYS201310232118431161501000_ST/1.png)
;
(3)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211843116150172/SYS201310232118431161501000_ST/2.png)
,验算i是否方程2x
4+3x
3-3x
2+3x-5=0的解;
(4)求证:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131023211843116150172/SYS201310232118431161501000_ST/3.png)
.
查看答案