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huongvithtt
2 năm trước
cho tam giác ABC , gọi M là trung điểm AB, D là trung điểm BC, N thuộc cạnh AC sao cho vecto CN= 2 vecto NA , K là trung điểm MN , biểu diễn vecto KD= m. vecto AB + n. vecto AC .GIá tri m-n=....
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