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thuong7148
2 năm trước
Biết cứ tăng `20^o C` thì dây đồng dài `1m` tăng thêm `0,58 mm` Tính chiều dài của dây đồng` 100 m` ở nhiệt độ `30^o C` đươc nung nóng đến `90^o C`
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