10) $$(\frac{2}{3}y^{6} + 1,2x^{11})(\frac{2}{3}y^{6} - 1,2x^{11})$$

10) $$(\frac{2}{3}y^{6} + 1,2x^{11})(\frac{2}{3}y^{6} - 1,2x^{11})$$

Используем формулу разности квадратов: $$(a+b)(a-b) = a^{2} - b^{2}$$

В нашем случае: $$a = \frac{2}{3}y^{6}$$, $$b = 1,2x^{11}$$

$$(\frac{2}{3}y^{6})^{2} - (1,2x^{11})^{2} = \frac{4}{9}y^{12} - 1,44x^{22}$$

Ответ: $$\frac{4}{9}y^{12} - 1,44x^{22}$$