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kthbts211
2 năm trước
cho tam giác có cạnh đays gấp 4 lần chiều cao, nếu chiều cao tăng thêm 2 cm, cạnh đây giảm 2cm thì tam giác có diện tích là 2,5 cm. tính độ dài cạnh đáy và chiều cao ban đầu
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