Cho $a, b, c$ là các số tự nhiên sao cho $28a+30b+31c=365$. Chứng minh rằng: $a+b+c=12$.
Chứng minh rằng: $a+b+c=12$.
Started By Zz Isaac Newton Zz, 16-08-2016 - 21:15
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Posted 16-08-2016 - 21:15
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