1、已知椭圆：a1^2=8,b1^2=5,所以c1^2=a1^2-b1^2=8-5=3所求双曲线设为x^2/a^2-y^2/b^2=1则有a^2=c1^2=3,c^2=a1^2=8,所以b^2=c^2-a^2=8-3=5故所求双曲线为x^2/3-y^2/5=12、已知双曲线：a1^2=9,b1^2=16,所以a1=3,b1=4,...