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nhungoc02
2 năm trước
có 3 điện trở R1=5`\Omega`,R2=10`\Omega`,R3=15`\Omega` mắc vào hiệu điện thế U=110V.Có bao nhiêu cách mắc.Tính điện trở tương đương,cường độ dòng điện qua mỗi điện trở
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