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Se stie ca:ab+ac=420 si b+c=14 aflati a

Răspuns :


ab+ac=420

b+c=14

a·(b+c)=a·14=420

a=420:14

a=30


ab+ac=420

a(b+c)=420, (scoatem factor comun)

a*14=420

a=30