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2 năm trước
Một thửa ruộng hình thang có đáy lớn là 120 m đáy bé bằng 3/2 đáy lớn chiều cao bằng 90m người ta cứ trồng lúa trên thửa ruộng đó trung bình cứ 100 mét vuông thu hoạch được 50 kg thóc hỏi thửa ruộng đó thu hoạch được bao nhiêu kilôgam thóc
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