F1、F2是椭圆x2a2+y29=1的左、右两焦点,P为椭圆的一个顶点,若△PF 发布时间:2017-04-28 10:42 │ 来源:www.tikuol.com 题型:填空题 问题: F1、F2是椭圆x2a2+y29=1的左、右两焦点,P为椭圆的一个顶点,若△PF1F2是等边三角形,则a2=______.
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