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minhbd01
2 năm trước
Một thửa ruộng hình thang có đáy lớn là 80m, đáy bé bằng đáy lớn và lớn, chiều cao bằng trung bình cộng độ dài hai đáy. Người ta cấy lúa trên thửa ruộng đó, trung bình cứ 100 m2 thu hoạch được 500kg thóc. Thửa ruộng đó người ta thu hoạch được số tạ thóc là:
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