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bài 3. hai bóng đèn có ghi đ1: 6v – 3w; đ2: 6v -6w. a. so sánh điện trở của chúng khi chúng sáng bình thường. b. để chúng sáng bình thường khi mắc vào hiệu điện thế 12v. ta phải mắc thêm điện trở rx nối tiếp với bộ hai bóng đèn. tính rx
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