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1990×92-89×1990+3×1990×9

Răspuns :

1990x92-89x1990+3x1991x9=1990(92-89+3x9)=1990(92-89+27)=1990(3+27)=1990x30=59.700
183080-177110+5970x9=
183080-177110+53730=
5970+53730=59700