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doanhbalo
2 năm trước
đoạn mạch gồm R1=20 ôm mắc nối tiếp R2=30 ôm vào mạch điện có hiệu điện thế U=6V a) Tính điện trở tương đương b) Tính cường độ qua đoạn mạch c) Tính hiệu điện thế qua R1
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