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ptmduyenbmt
2 năm trước
Một thửa ruộng hình chữ nhật có chiều dài 120 mét, chiều rộng bằng 2/3 chiều dài. Người ta cấy lúa ở đó, tính ra cứ 100 mét vuông thu hoạch được 50 kg thóc. Hỏi đã thu hoạch được bao nhiêu tạ thóc
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