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determinati nr a,b,c,d pentru care au loc egalitatile ab+ba+ca=abc

Răspuns :

ab+ba+ca=abc2ab+ac+abc=abc+abc
abc+2ab+ac=0
a(bc+2b+c)=0
a(bc+2b+c)/bc+2b+c=0/bc+2b+c
a=0/bc+2b+c