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a fost răspuns

calculeaza in scris si efectueaza proba prin adunare repetata;42×2;31×3;12×4;30×4;44×3;21×5;18×3:

Răspuns :

42*2=84,31*3=93,12*4=48,30*4=120,44*3=132,21*5=105,18*3=54