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Răspuns:
a. dam factor comun 451
451(-157-43+200)=451*0=0
b. dam factor comun 753
753(-81-19)=753*(-100)=-7530
c. dam factor comun -642
-642(-53+50-17)=-642*(-20)=1284
d. dam factor comun -501
-501(-11+10)=-501(-1)=501