Một thửa ruộng hình thang có đáy bé 26m,đáy lớn hơn đáy bé 8m,đáy bé hơn chiều cao 6m. Trung bình cứ 100m2 thu hoạch đc 70,5kg thóc. Hỏi ruộng đó thu hoạch đc baonhiu tạ thóc?

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