[tex] \frac{0.1 {a}^{3} + 0.8 }{0.2 {a}^{2} - 0.8 } \div \frac{0.5 {a}^{2} - a + 2 }{0.25a + 0.5} = \frac{5 a_{1}5 {a}^{3} + 4 }{2 {a}^{3} - 8 {a}^{2} + 16a - 16 } [/tex]