Répondre :
17² = (15 + 2)² = 225 + 60 + 2 = 287
32² = (30 + 2)² = 900 + 120 + 4 = 1024
52*48 = (50 + 2)(50 - 2) = 2500 - 4 = 2496
32² = (30 + 2)² = 900 + 120 + 4 = 1024
52*48 = (50 + 2)(50 - 2) = 2500 - 4 = 2496