Bạn Hòa làm thí nghiệm đo hiệu điện thế của đoạn mắc nối tiếp và thu được kết quả sau đây: U = 3V; U1 = 1,5V. Kết quả U2 sẽ bằng bao nhiêu? A. 4,5V B. 1,5V C. 2,5V D. 4,0V

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