Răspuns
2) (2a+3b+c+a+2b+3c+3a+b+2c)\2=(6a+6b+6c)\2=3a+3b+3c 3) 2,3,5,7,12,13,15,17,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,42,43,45,47,50,41,52,53,54,55,56,57,58,59 ,62,63,65,67,70,71,72,73,74,75,76,77,78,79,82,93,85,87,92,93,95,97
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