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daca ab+ac=7 si b+c=3,aflati a

Răspuns :

ab+ac=7 => a(b+c)=7 => a·3=7 => a=[tex] \frac{7}{3} [/tex]
ab+ac=7
b+c=3
⇒a[b+c]=7
⇒a·3=7
⇒a=7/3
⇒a=2,[3];