CHO HÌNH BÌNH HÀNHABCD. ĐẲNG THỨC NÀO SAU ĐÂY SAI

Câu 12. Cho hình bình hành

ABCD

. Đẳng thức nào sau đây sai ?

A.

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^AB

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^DC

.

B.

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^AC

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^AB

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^AD

.

C.

^

^BD

^

^

^BC

^

^

^BA

.

D.

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^AB

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^AC

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^

^AD

.