Question

Stiind ca x supra y este 0,7 aflati valoarea raportului :3 ori x plus 4 ori y supra 5x plus 2 y. URGENTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT!!!!!!!!!!!

Answer 1

Explicație pas cu pas:

Salutare!

$\bf \dfrac{x}{y} = \dfrac{7}{10} \implies \: x = \dfrac{7}{10} \cdot y$

$\bf \dfrac{3x + 4y}{5x + 2y} = \dfrac{3\dfrac{7y}{10} + 4y}{5\dfrac{7y}{10} + 2y} = \dfrac{\dfrac{21y}{10} + 4y}{\dfrac{35y}{10} + 2y}$

$\bf \dfrac{\dfrac{21y + 40y}{10}}{\dfrac{35y + 20y}{10}} = \dfrac{\dfrac{61y}{10}}{\dfrac{55y}{10}} = \dfrac{61y}{10} \cdot \dfrac{10}{55y} = \dfrac{61y}{ \not10} \cdot \dfrac{ \not10}{55y} = \dfrac{61}{55}$

$\boxed {\bf \dfrac{61}{55} }$