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Binh nhất
Cho tam giác $ABC,I$ là điểm nằm trên tia đối tia $CB$ thoả $IB=3IC.J,K$ thuộc $AC,AB$ thoả $JA=2JC,KB=3KA.$
Tính $\vec{BC}$ theo $\vec{AI}, \vec{JK}.$
Edited by halloffame, 21-09-2017 - 00:33.
dân chơi it
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