Một thửa hình thang có diện tích là 450m2,đáy lớn dài hơn đáy nhỏ 15m.Tính độ dài mỗi đáy biết rằng nếu tăng đáy lớn thêm 6,5m thì diện tích thửa ruộng sẽ tăng thêm 65m2

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