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Dragon2000
2 năm trước
Một thửa ruộng có chiều dài 150m. Chiều rộng kém 3 lần chiều dài. Người ta trồng lúa ở đó. Cứ 10m2 thì thu hoạch được 5kg thóc. Hỏi cả thửa ruộng đã thu hoạch bao nhiêu yến thóc ?
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