cho tứ giác ABCD 
a. Gọi M,N,O lần lượt là trung điểm của AB,CD,MN. G1,G2,G3,G4 lần lượt là trọng tâm các \triangle  BCD, ACD,ABD,ABC .chứng minh rằng
AG1,BG2,CG3,DG4 đồng quy

Câu hỏi này được treo giải thưởng trị giá +2000 vỏ sò bởi lamanha1.2000@gmail.com, đã hết hạn vào lúc 02-08-15 05:21 PM

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