87 razy 50 oblicz sprytnie i 564 razy 50 oblicz sprytnie daje naj

87*50=80*50+7*50=4000+350=4350 564*50=500*50+60*50+4*50=25000+3000+200=28200

87*50 = (80 + 7)*50 = 80*50 + 7*50 = 4000 + 350 = 4350 564*50 = (500 + 60 + 4)*50 = 500*50 + 60*50 + 4*50 = 25000 + 3000 + 200 = 28200