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foloseste factorul comun (5+17)*(31+27)+(5+17)*(19+23)


Răspuns :

dai factor comun pe (5+17)
(5+17)(31+27+19+23)=22*100=2200
(5+17)*(31+27)+(5+17)*(19+23)
5+17(31+27+19+23)
(5+17)*100
22*100
2200