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整數是最小的,可以得知乘積也是最小的;所以積最少是四位數,從千位上是1,開始討論可知:123÷13≈9.46是小數;1123÷13≈86.38是小數;2123÷13≈163.31是小數;3123÷13≈240.23是小數;4123÷13≈317.15是小數…
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