圆锥曲线焦长与焦比体系VIP

1.椭圆圆锥曲线-焦长与焦比体系sin0xb1是.一曲一+(2C)!-(2ii-m)2=2m^(2c)casa；聲理得|£j-rcos^①灣得、则过焦点的弦论\AB\=同理：n2+(2£...