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ntt41103
2 năm trước
Một thửa ruộng hình thang có trung bình cộng độ dài hai đáy là 35,75 m Nếu tăng đáy lớn thêm 7,2 m thì diện tích thửa ruộng sẽ tăng thêm 86,4 mét vuông. Hỏi thửa ruộng đó thu hoạch được bao nhiêu kg thóc biết rằng mỗi a thu hoạch 65 kg thóc.
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