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germanyduy
2 năm trước
Một điện mạch gồm điện trở R1, mắc nối tiếp với điện trở R2=9Π. Hđt 2 đầu R1 và 2 đầu mạc lần lượt là U1=3V; U=12V. Tính điện trở R1.
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