问题
选择题
椭圆
|
答案
依题意可知e1=
=a2-b2 a
，3 4
e2=
=a2+b2 a
，3 4
∴有相同的离心率
故C正确．
故选C
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椭圆
|
依题意可知e1=
=a2-b2 a
，3 4
e2=
=a2+b2 a
，3 4
∴有相同的离心率
故C正确．
故选C
| 从下面的方框中选出适当的句子补全对话 | |
| A: Excuse me! Are you new here? B: Yes, I am. A: 1 . B: My name is Angela. A: I'm Cindy. Nice to meet you. B: 2 ,too. A: Angela, 3 . She's English . B: 4 . C: How do you do? A: Oh it's late and I must go home . B: 5
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