1) х²у² - 4/9 = (ху)² - (2/3)² = (ху - 2/3)(ху + 2/3)
2) 0,01с² - d⁸ = (0,1c)² - (d⁴)² = (0,1c - d⁴)(0,1c + d⁴)
3) - 1 + 49a⁴b⁸ = (7a²b⁴)² - 1² = (7a²b⁴ - 1)(7a²b⁴ + 1)
4) 0,81y¹⁰ - 400z¹² = (0,9y⁵)² - (20z⁶)² = (0,9y⁵ - 20z⁶)(0,9y⁵ + 20z⁶)
5) a⁴ - b⁶ = (a²)² - (b³)² = (a² - b³)(a² + b³)
6) 1 7/9m²n² - 1 11/25a⁶b² = (4/3mn)² - (6/5a³b)² = (1 1/3mn - 1 1/5a³b)(1 1/3mn + 1 1/5a³b)