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Ducbac1141
2 năm trước
đặt một hiệu điện thế u vào hai đầu đoạn mạch có các điện trở R1= 3 ôm, R2= 6 ôm mắc nối tiếp. cường độ dòng điện trong đoạn mạch là 0.5A. Tính HĐT ? U1 =? ; U2 = ?
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