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nguyenngocnhuthpt
2 năm trước
CHO 6 ĐIỂM M,N,P,Q,R,S. CM: A. MN + PQ=MQ + PN ( có dấu vecto ở trên nha) B. MP + NQ + RS = MS + NP + RQ( có dấu vecto ở trên nha)
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