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题目已知a、b、c都是非负整数,且28a+30b+31c=365,求a+b+c的值.分析这道题初看上去,给人的感觉是无
Problem It is known that a, b, c are all non-negative integers, and that 28a + 30b + 31c = 365, find the value of a + b + c.