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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 ) = 420
a x 14 = 420
14 a = 420
a = 420 : 14
a = 30


ab+ac=420

a·(b+c)=420

a·14=420

a=420:14

a=30