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Cho sơ đồ mạch điện gồm hai đèn mắc song song , hai vôn kế đo hiệu điệ thế hai đầu mỗi bóng đèn . Nếu trong mạch điện trên ta tháo bóng Đ1 thì bóng Đ2 có sáng ko , vì sao , hãy vẽ lại mạch điện khi đó
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