Question

椭圆2x²+3y²=6的焦距是

A.2                                                                 B.2(－)

C.2                                                           D.2(+)

Answer 1

A

解析:

将2x²+3y²=6化为标准方程为+=1，

∴a²=3,b²=2,c²=3－2=1，

焦距2c=2×1=2.