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数学
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How many 3-digit numbers are divisible by
人气:302 ℃ 时间:2020-03-27 17:06:19
解答
意思大概是,有多少个能被7整除的3位数,共128个,做法是,最小能被7整除的三位数是105,最大994,从105到994共890个数字,除以7等于127余点东西,所以是128个
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