设点P为直线y=b2ax与椭圆x2a2+y2b2=1(a>b>c>0)在第一象限 发布时间:2017-04-27 20:33 │ 来源:www.tikuol.com 题型:填空题 问题: 设点P为直线y=b2ax与椭圆x2a2+y2b2=1(a>b>c>0)在第一象限内的交点,点F是椭圆的右焦点,若PF垂直于x轴,则椭圆的离心率e=______.
题型:填空题 Lloyd's, an association of London underwriters, developed from a small seventeenth century London coffee house, ______ underwriters at that time met to do business.A.whereB.in thatC.which D.that 查看答案