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nguyenkimtuyen.ulis
2 năm trước
2 bóng đèn đ1 và đ2 mắc song song trong 1 mạch điện kín hiệu điện thế giữa 2 đầu bóng đèn đ1 bằng 5,5v. hiệu điện thế giữa 2 đầu bóng đèn đ2 là : a 3v,b 5,5v ,c 11v ,d 10v.
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