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2 năm trước
Một lò xo có chiều dài tự nhiên là 15cm, treo một quả cân lên lò xo thì lò xo dài 18cm, rồi tiếp tục treo thêm 2 quả cân. a) Tính độ biến dạng của lò xo b) Chiều dài của lò xo khi treo 3 quả cân là bao nhiêu?
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