1) (7100-7)²-4100-50 = (700-7)²-400-50 = 693²-450 = 480249-450 = 4797992) (5173+3)²-25173²-25173+1 = (865+3)²-47125-4325+1 = 868²-51450 = 753424-51450 = 7019743) (611-5)(611+5)-(611-5)² = (66-5)(66+5)-(66-5)² = 61*71-61² = 4331-3721 = 610
1) (7100-7)²-4100-50 = (700-7)²-400-50 = 693²-450 = 480249-450 = 479799
2) (5173+3)²-25173²-25173+1 = (865+3)²-47125-4325+1 = 868²-51450 = 753424-51450 = 701974
3) (611-5)(611+5)-(611-5)² = (66-5)(66+5)-(66-5)² = 61*71-61² = 4331-3721 = 610