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ducvuong
2 năm trước
cho mạch điện mắc như hình vẽ, biết R1=6 ôm, R2=15 ôm, R3=30 ôm và hiệu điện thế giữa 2 đầu R1 là 18V. Tính cường độ dòng điện qua mỗi điện trở
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