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yennguyenvungoc157767598
2 năm trước
mọi người giúp em câu này vớiaj 1) cho 6 điểm A,B,C,D,E,F. chứng minh: a) vectoAB+vectoDC=vectoAC+vectoBD b) vectoAD+vectoBD+vectoCF=vectoAE+vectoBF+vectoCD
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