Cuộn dây xanh dài 382 dm và ngắn hơn cuộn dây đỏ dài 1m hỏi cuộn dây đỏ dài bao nhiêu dm

To solve this problem, we can use the following equation to represent the given information: Let's assume the length of the red string is \( x \) meters. We know that the length of the green string is 382 dm and shorter than the red string by 1 meter. So, we can write the equation as: \[ x - 1 = 382 \] To find the length of the red string in decimeters, we need to convert it from meters to decimeters. Since 1 meter is equal to 10 decimeters, we can express this as: \[ x = (x \times 10) \text{ dm} \] Now, let's solve for \( x \): \[ x - 1 = 382 \] \[ x = 382 + 1 \] \[ x = 383 \] Finally, converting \( x \) from meters to decimeters: \[ x = (383 \times 10) = 3830 \text{ dm} \] So, the length of the red string is \(392.0\) dm. Therefore, cuộn dây đỏ dài bao nhiêu dm là \(392.0\) dm.