[tex] - \frac{1}{2} x \times ( - 2x) {}^{2} + (\frac{4}{9} x^5 ) \div ( \frac{2}{27} x ^{2} ) - 0.4x \times ( - 5x^{2} ) \\ \: \: - \frac{1}{2} x \times 4x^{2} + \frac{4}{9} \times \frac{27}{2} x^{3} - \frac{2}{5} {x} \times ( - 5 {x}^{2} ) \\ - 2{x}^{3} + 6x^{3} + 2x3 \\ 6x ^{3} [/tex]
