Cho mạch điện có R1 = 3 ôm , R2 = 6 ôm mắc song song với nhau. I1 = 0.5A. Tìm: a) R điện trở của mạch. b) Tính hiệu điện thế của mạch c) Tính cường độ dòng điện trong mạch và cường độ dòng điện trở R2.

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