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thaonguyenchcb
2 năm trước
Một thửa ruộng hình chữ nhật có chu vi 160m, chiều rộng bằng 3/5 chiều dài. Người ta cấy lúa trung bình 100m2 thu hoạch 80kg thóc. Hỏi: A. Cả thửa ruộng thủ được bao nhiêu tạ thóc? B. Bán số thóc đó với giá 780 000 đồng 1 tạ thì thu được tất cả bao nhiêu tiền?
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