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lecaothungan205
2 năm trước
Sử dụng bất đẳng thức tam giác để tính : Cho góc xOy, lấy 2 điểm A và B lần lượt trên Ox và Oy Trên tia đối của Ox lấy điểm C, trên tia đối Oy lấy điểm D Chứng minh : AB + BC + CD + DA < 2 ( AC + BD )
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