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pvannguyenphuongquynh
2 năm trước
1 hcn ban đầu có chu vi 2010cm .Biết rằng nếu tăng chiều dài hcn đó thêm 20cm và tăng chiều rộng thêm 10cm thì diện tích hcn ban đầu tăng lên 13300 cm^2 .Tính chiều dài chiều rộng ban đầu
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