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vuquangdai87
2 năm trước
cho mạch điện như hình vẽ E1=9v ,r1=1Ω, E2=12v ,r2=2Ω,R1=2Ω,R2=4Ω,R3=6Ω.Tinh cuong do dong dien qua cac nhanh uab váo chỉ của vôn kế
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