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Câu 6:

Cho hình bình hành $ABCD$

Câu 6: Cho hình bình hành ABCDABCDABCD tâm O.O.O. Đẳng thức nào sau đây sai?

Thông tin câu hỏi

Câu 6:

Cho hình bình hành $ABCD$ tâm $O.$ Đẳng thức nào sau đây sai?