椭圆方程为:x^2/8+y^2/5=1,c(椭)=√3,其焦点坐标为(-√3,0),(√3,0),设双曲线方程为:x^2/a^2-y^2/b^2=1,a=√3,c(双曲线)=2√2,b^2=c^2-a^2=5,双曲线方程为:x^2/3-y^2/5=1.