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efectuati
(ab+bc+ca) / (a+b+c)=


Răspuns :

[tex]\frac{ab+bc+ca}{a+b+c}=\frac{10a+b+10b+c+10c+a}{a+b+c}=\frac{11a+11b+11c}{a+b+c}=\frac{11*(a+b+c)}{a+b+c}=11[/tex]