A.x²-y²=96                                 B.y²-x²=160

C.x²-y²=80                                 D.y²-x²=24

与曲线共焦点,而与曲线共渐近线的双曲线方程为(　　)

A.                   B.

C.                  D.

A.x²-y²=96                                         B.y²-x²=160

C.x²-y²=80                                         D.y²-x²=24

已知△ABC外接圆半径R=,且∠ABC=120°,BC=10,边BC在x轴上且y轴垂直平分BC边,则过点A且以B,C为焦点的双曲线方程为(　　)

(A)-=1 (B)-=1

(C)-=1 (D)-=1

A.                          B.

C.                          D.