6) 52⁶ – 40s¹²;

б) $$52^6 - 40s^{12}$$

$$=(52^3)^2 - (2\sqrt{10}s^6)^2$$

$$=(125+64)(15625-80+4096)$$

$$=(52^3 - 2\sqrt{10}s^6)(52^3 + 2\sqrt{10}s^6)$$

Ответ: $$(52^3 - 2\sqrt{10}s^6)(52^3 + 2\sqrt{10}s^6)$$