推荐回答（2个）
依题意得：
用逆推法，最终3人邮票数目相同，则设最终每人邮票数目为n
先由题设“最后丙又又拿出自己现有邮票的一半平分给甲、乙”，可知，在这之前：丙邮票数目为2n（计算过程：n/0.5=2n），甲和乙邮票数目均为0.5n（计算过程：n/2=0.5n，n-0.5n=0.5n）
然后由题设“然后乙也拿出自己现有的邮票的一半分给甲、丙”，可知，在这之前：乙邮票数目为n（计算过程：0.5n/0.5=n），甲邮票数目为0.25n（计算过程：0.5n/2=0.25n，0.5n-0.25n=0.25n），丙邮票数目为1.75n（计算过程：0.5n/2=0.25n，2n-0.25n=1.75n）
最后由题设“甲先拿出自己的一半平分给乙、丙”，可知，在这之前：甲邮票数目为0.5n（计算过程：0.25n/0.5=0.5n），乙邮票数目为0.875n（计算过程：0.25n/2=0.125n，n-0.125n=0.875n），丙邮票数目为1.625n（计算过程：0.25n/2=0.125n，1.75n-0.125n=1.625n）
又因为邮票数目应为正整数，所以n只能是16的整倍数，也就是设n=16m，即甲邮票原来有0.5n=8m，乙邮票原来有0.875n=14m，丙邮票原来有1.625n=26m，m为正整数。
上面的解法是算术解法，而不是列方程的解法。因为你的题目没有明确数字，所以答案不是唯一的，比如：
甲：8，乙：14，丙：26
甲：16，乙：28，丙：52
甲：24，乙：42，丙：78
等等都是答案。
所以答案是甲邮票原来有8m，乙邮票原来有14m，丙邮票原来有26m，m为正整数。（只要符合m∈N+，都为答案）
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