CHO HÌNH TỨ DIỆN ABCD CÓ TRỌNG TÂM G

Câu 57: Cho hình tứ diện ABCD có trọng tâm G. Mệnh đề nào sau đây sai?

A.

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^AG

^

²

₃

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^{AB AC AD}

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

B.

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^AG

^

¹

₄

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^{AB AC AD}

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

D.

GA GB GC GD





















































































































































0

C.

^OG































¹

₄





























OA OB OC OD

























































































