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Aflati nr de forma ab daca: ab+ba=4a+4b+56

Răspuns :

10a+b+10b+a=4a+4b+56
11a+11b-4a-4b=56
7a+7b=56
7(a+b)=56
a+b=8
nr de forma ab sunt 17,26,35,44,53,62,71