Cho 3 điện trở R1 = 10Ω , R2 = 20Ω , R3 = 30Ω được mắc song song với nhau vào hiệu điện thế 18V . Biết dòng điện chạy qua R2 là 1,5A . Tính hiệu điện thế giữa hai đầu đoạn mạch và cường độ dòng điện chạy trong mạch chính

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