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daca ab+ac+a=749 si b+c=106, aflatil pe a

Răspuns :

ab+ac+a=749
dam factor comun pe a
a×(b+c+1) = 749
a×(106+1) = 749
a×107 = 749
a = 749:107
a = 7
ab+ac+a=749
a(b+c+1)=749
a(106+1)=749
a
×107=749
a=749:107
a=7
.......................
q.e.d.