Cho ba điểm A, B và C. Trên AB lấy D sao cho AD:BD có tỉ lệ 2:1. Tương tự lấy E trên BC sao cho BE:CE là 3:1, F trên AC và  CF:AF có tỉ lệ 3:1. Biểu diễn
a. Véctơ DE, DF theo véctơ AB, AC.
b. Véctơ AB, AC theo véctơ DE, DF.

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