3.How much is the jacket?
A.Six hundred US dollars.
B.One hundred Hong Kong dollars.
C.Six hundred Hong Kong dollars.
2.Why can't the woman go to the film today?
A.She has another plan. B.She doesn't like the film.C.She is not feeling well.
A.At 4:30. B.At 4:45. C.At 5:20
1.When will Susan come?
A.£ 19.15. B.£ 9.15. C.£ 9.18.
答案是B。
(Ⅲ)将曲线向右平移2个单位得到曲线,设曲线的准线为,焦点为,过作直线交曲线于两点,过点作平行于曲线的对称轴的直线,若,试证明三点(为坐标原点)在同一条直线上.
(Ⅱ)设椭圆的左焦点为,左准线为,动直线垂直于直线,垂足为点,线段的垂直平分线交于点,求动点的轨迹的方程;
(Ⅰ)求椭圆的方程;
已知椭圆,它的离心率为,直线与以原点为圆心,以椭圆的短半轴长为半径的圆相切.