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Congthuan20172018
2 năm trước
một thửa ruộng hình thang có đáy lớn là 28m đáy bé 18m và chiều cao hơn đáy bé 7m a, tính diện tích thửa ruộng b, người ta cấy lúa trên thửa ruộng đó ,cứ 100m2 thu được 62kg thóc tính số kg thóc thu được trên thửa ruộng đó
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