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nguyenthithanhxuanhd03032002
2 năm trước
cho mạch điện như hình. R1=5, R2=R4= 10, R3=8 a)tính $R_{MN}$ b)thay ampe kế bằng vôn kế, tính điện trở tương đương của mạch khi đó
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