△ABC中,AB=,AC=,BC=2,设P为线段BC上一点,且,则一定有( )
A.AB•AC>PA2,AB•AC>PB•PC | B.PA2>AB•AC,PA2>PB•PC |
C.PB•PC>AB•AC,PB•PC>PA2 | D.AB•AC>PB•PC,PA2>PB•PC |
推荐套卷
△ABC中,AB=,AC=,BC=2,设P为线段BC上一点,且,则一定有( )
A.AB•AC>PA2,AB•AC>PB•PC | B.PA2>AB•AC,PA2>PB•PC |
C.PB•PC>AB•AC,PB•PC>PA2 | D.AB•AC>PB•PC,PA2>PB•PC |