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Alflati a, daca b+c=5 si ab+ac+7a=96


Răspuns :

ab+ac+7a= 96 => a(b+c+7)=96 => a(5+7)=96 => 12a=96/ :12 => a= 96/12 => a=8

a(b+c)+7a =96                    b+c=5

5a+7a=96

12a=96

a=96:12

a=8