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Calculeaza a x b + a x c =?, stiind ca:
a=9 x 102 - 4 x 229
(b+c) : 3 = 128


Răspuns :

a=918-916=2
(b+c):3=128=>b+c=128x3=>b+c=384
ab+ac=a(b+c)=2x384=768