题目双曲线x^2/9-y^2/16=1的离心率是?A. 4/3B. 5/4C. sqrt(7)/3D. 5/3双曲线$x^{2}/9-y^{2}/16=1$的离心率是?A. 4/3B. 5/4C. $\sqrt{7}/3$D. 5/3题目解答答案D. 5/3