已知F1、F2为椭圆=1(a>b>0)的两个焦点,过F2作椭圆的弦AB,若△AF1B的周

已知F1、F2为椭圆=1(a>b>0)的两个焦点,过F2作椭圆的弦AB,若△AF1B的周长为16,椭圆离心率e=,则椭圆的方程是(    )

A.=1                             B.=1

C.=1                             D.=1

答案

D

解析:∵4a=16,∴a=4.

又e==,∴c=2.∴b2=4.

相关题目

 阅读理解。 I really like the Seaview Hotel. It's quite big. It has two
 阅读理解。 I really like the Seaview Hotel. It's quite big. It has two hundred rooms. It's only a hundred meters from the sea. Bed for one night is eighty pounds per person. The staff are fr
He made three good friends in the university, ______ joined the army after gradu
He made three good friends in the university, ______ joined the army after graduation. A. one of them        B. one of whom       C. one            D. one of which
某隐性遗传病的发病率出现男性明显高于女性的现象,则该
某隐性遗传病的发病率出现男性明显高于女性的现象,则该遗传病的致病基因位于 A.常染色体上     B.X染色体上     C.Y染色体上          
下面是胰岛素分子的有关计算公式,不正确的有  (   )
下面是胰岛素分子的有关计算公式,不正确的有  (   ) A.胰岛素分子中氨基数=肽链数+R基上的氨基数=各氨基酸中氨基的总数-肽键数 B.胰
The global financial crisis, ______ started in the USA in 2008, affects almost e
The global financial crisis, ______ started in the USA in 2008, affects almost every country, especially some developed countries. A. what         B. it           C. which     
一定温度下,某一密闭恒容的容器内可逆反应A(g) + 3B(g) === 2C(
一定温度下,某一密闭恒容的容器内可逆反应A(g) + 3B(g) === 2C(g)达到平衡状态的标志是(    )。A.C的生成速率与C的分解速率相等B.容器内混合气体的密
1972年的《中美上海公报》声明:“台湾海峡两岸的中国人都
1972年的《中美上海公报》声明:“台湾海峡两岸的中国人都认为只有一个中国,台湾是中国的一部分。美国政府对这一立场不提出异议。”这表明美国
(本小题满分12分)在数列,是各项均为正数的等比数列,设
(本小题满分12分)在数列,是各项均为正数的等比数列,设.(Ⅰ)数列是否为等比数列?证明你的结论;(Ⅱ)设数列,的前项和分别为,.若,,

最新题目