Question

stiind ca x/y=0,8 calculati 4y-3x totul supra 5y-4x

Answer 1

$\frac{x}{y} = \frac{8}{10} = > x = \frac{8y}{10} = > \frac{4y - 3 \times \frac{8y}{10} }{5y - 4 \times \frac{8y}{10} } = > \frac{4y - \frac{24y}{10} }{5y - \frac{32y}{10} } = > \frac{ \frac{16y}{10} }{ \frac{18y}{10} } = > \frac{16y}{10} \times \frac{10}{18y} = > \frac{16y}{18y} = > \frac{16}{18} = \frac{8}{9}$