Вправи 601 - 750 » 720

(1 + 1)2 = 22 = 4; (2 + 1)2 = 32 = 9; (3 + 1)2 = 42 = 16; (4 + 1)2 = 52 = 25; (5 + 1)2 = 62 = 36. 12 + 2 • 1 + 1 = 4; 22 + 2 • 2 + 1 = 4 + 4 + 1 = 9; 32 + 2 • 3 + 1 = 9 + 6 + 1 = 16; 42 + 2 • 4 + 1 = 16 + 8 + 1 = 25; 52 + 2 • 5 + 1 = 25 + 10 + 1 = 36.