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Maichi2011
2 năm trước
Trong mặt phẳng oxy,cho tam giác ABC có A(0;2),B(1;-3),C(2;1).Phép tịnh tiến T vecto AC biến tam giác ABC thành tam giác A phẩy B phẩy C phẩy.Tìm toạ độ trọng tâm của tam giác A phẩy B phẩy C phẩy
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