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susususs20
1 năm trước
cho hệ ba điện cô lập q1,q2,q3 lần lượt đặt cố định tại ba điểm A,B,C . biết q1=4q2 , ab=30cm và luc tổng hợp do q1,q2 tac dung lên q3 bằng 0 . vị trí của q3 tại C là
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