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utilizand factorul comun aratati ca:
3^18+3^17=4*3^17


Răspuns :

3^17 (3+1)=4*3^17
3^17*4=4*3^17
3^18+3^17=4•3^17
3^17(3^1+1)=4•3^17
3^17(3+1)=4•3^17
3^17•4=4•3^17
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