[tex]( \frac{3}{8} x - \frac{9}{16} ) \times (x - \frac{4}{5} ) = \\ = \frac{3}{8} {x}^{2} - \frac{12}{40} x - \frac{9}{16} x + \frac{36}{80} = \\ = \frac{3}{8} {x}^{2} - \frac{3}{10} x - \frac{9}{16} x + \frac{9}{20} = \\ = \frac{30 {x}^{2} - 24x - 45x + 36 }{80} = \frac{30 {x}^{2} - 69x + 36 }{80} = \\ = \frac{30 {x}^{2} - 69x + 9 }{20} [/tex]
Sper ca te-am ajutat
