xác định M thỏa mãn : cho tam giác ABC
a) 2vectơMA-vectơMB=vectơ0
b)vectơ MA +2vectơMB+vectơCB=vectơ0
xác định M thỏa mãn : cho tam giác ABC a) 2vectơMA-vectơMB=vectơ0 b)vectơ MA +2vectơMB+vectơCB=vectơ0
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