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joy231102
1 năm trước
hai nguồn điện E1,E2(E1=12v,E2=11v,r1=r2=0.5 được mắc các cực cùng tên với nhau , mạch ngoai mắc với biến trở R . để cương dô dong dien qua E2 bằng 0 thì giá trị cua bien tro R la
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