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a-b=14 c=21 ac-ab=?...................PLEASE!!!!!!!!!!!!!!!!!! Dau coroana!!!!!!!!!!!!!!!!!!!!!!

Răspuns :

ac-ab
aflam b=14:2=7
dam factor comun a×(c-b)=a×(21-7)
a=14-7=7
7×(21-7)=7×14=98