2025 = (20 + 25)² 2025 = 45² 2025 = 1³+2³+3³+4³+5³+6³+7³+8³+9³ 2025 = (1+2+3+4+5+6+7+8+9)² 2025 = 1+3+5+7+9+11+...+89 2025 = 9² x 5² 2025 = 40² + 20² + 5²