x^2/25+y^2/9=1a^2=25,b^2=9c^2=a^2-b^2=16c=4焦点相同,则焦点坐标是(4,0)(-4,0)双曲线:a^2+b^2=c^2=16e=c/a=2a=c/2=2b^2=16-4=12双曲线方程是x^2/4-y^2/12=0渐近线方程为y=(+/-)b/ax=(+/-)2根号3/2 X=(+/-)根号3 x...