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nhung86.nnn
2 năm trước
một thửa ruộng hình thang vuông có cạnh bên vuông góc với 2 đáy dài 30,5 m đáy lớn 120,4m đáy bé 79,6m a tính diện tích thửa ruộng bằng dam vuông b trung bình 100 dam vuông thu được 65,2 kg thóc. hỏi trên cả thửa ruộng thu được bao nhiêu kg thóc
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