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Aratati ca nr a =17 17×2 17×3 ..... 17×17este patrat perfect va rog frumos 25 de puncte


Răspuns :

a=17+17x2+17x3+………+17x17
a=17+34+51+………+17x17
a=17+85+………+17x17
a=102+………+289
a=102+289
a=391