Cho mạch điện như hình vẽ. Biết Umn=18V cường độ dòng điện qua R2 là I2=2A. Tìm a) R1 nếu R2=6 ôm, R3= 3 ôm

b) R3 nếu R1= 3 ôm R2=1 ôm

c) R2 nếu R1=5 ôm, R3= 3 ôm

Your answer would be false

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