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Cate numere naturale de forma a7b in baza 10 se divid la 5?


Răspuns :

170,270,370,470,570,670,770,870,970
175,275,375,475,575,675,775,875,975 
rezulta 18 nr
170,175,270,275,370,375,470,475,570,575,670,675,770,775,870,875,970,975
18 numere