Question

cum se rezolva exercitiile : - 5 supra 8x + 7 supra 4 = 0 ;     2 intregi 4 supra 5 + 2 intregi 1 supra 4 ori x = 3 intregi 2 supra 4

Answer 1

$- \frac{5}{8x} + \frac{7}{4} =0$

$- \frac{5}{8x} =- \frac{7}{4} |*(-1)$ ⇒$\frac{5}{8x} = \frac{7}{4}$⇒$8*7x=5*4$⇒ $x= \frac{20}{56} = \frac{5}{14} =0,35[/tex<span>] </span><span>[tex] \frac{14}{5} + \frac{9}{4} x= \frac{14}{4}$⇒$\frac{9}{4} x= \frac{7}{2} - \frac{14}{5}$⇒$x= \frac{7*5-14*2}{10} * \frac{4}{9} = \frac{35-28}{5} * \frac{2}{9} = \frac{7*2}{5*9}= \frac{14}{45} =0,31$