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efectueaza in doua moduri (150+120)×2=

Răspuns :

Primul mod : (150+120)x2 = 270x2= 540
Al doilea mod : (150+120)x2 =
= 150x2 + 120x2 =
= 300 + 240 =
= 540
(150+120)x2=270x2=540
150+(120x2)=150+240=390