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thrtom
2 năm trước
Cho cac diem phan biet A,B, C, D, E, F. Đẳng thức nào sai A. Vectơ AB + CD + EF = AF + ED + BC B. Vectơ AB + CD + EF = AF + ED + CB C. Vectơ AE + BF + DC = DF + BE + AC D. Vectơ AC + BD + EF = AD + BF + EC
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