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thuba_thd
2 năm trước
2 thửa ruộng HCN có tổng CV=420m, nếu CD thửa ruộng thứ nhất giảm 5m, Cr của nó tăng lên 2m thì CV 2 thửa ruộng sẽ bằng nhau. Tìm CV mỗi thửa ruộng.
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