Răspuns :
1 mod:
75×42+75×120=3150+9000= 12150
al 2-lea mod:
75×(42+120)=75×162=12150
75×42+75×120=3150+9000= 12150
al 2-lea mod:
75×(42+120)=75×162=12150
75×42=3150
75.120=7512
3150+7512=10662
Al doilea mod
75×42+75=3225
3225.120=10662
75.120=7512
3150+7512=10662
Al doilea mod
75×42+75=3225
3225.120=10662