设F1、F2为椭圆x24+y22=1的两个焦点,过椭圆中心任作一条直线与椭圆交于 发布时间:2017-04-26 12:35 │ 来源:www.tikuol.com 题型:填空题 问题: 设F1、F2为椭圆x24+y22=1的两个焦点,过椭圆中心任作一条直线与椭圆交于P、Q两点,当四边形PF1QF2的面积最大时,PF1•PF2的值等于______.
题型:填空题 ---Whose notebook is this? --- It ________ belong to Lucy. Look, her name is in it.A.mustB.canC.can’tD.need 查看答案