【简答题】已知直线 l:y=x+ 6 ,圆O:x 2 +y 2 =5,椭圆 C: x 2 a 2 + y 2 b 2 =1(a>b>0) 的离心率 e= 3 3 ,直线l被圆O截得的弦长与椭圆的短轴长相等. (Ⅰ)求椭圆C的方程; (Ⅱ)过椭圆右焦点F的直线l与椭圆C交于A,B两点. (1)若 AF =2 FB 求直线l的方程; (2)若动点P满足 OP = OA + OB ,问动点P的轨迹能否与椭圆C存在...
【简答题】根据短文内容判断正 (T)误 (F) 。 What is time? We can't see it and we can't catch hold of it, but we can feel it passing by. Time is always with us in our life. When we are at the table, time passes away while...