Question

haideti cat mai repede va rog!

Answer 1

$\frac{x}{y} = \frac{4}{5} \implies y = \frac{5x}{4} \\ \sout{ - - - - - - - - - - - - - - - - }\\ \frac{5x - \frac{5x}{4} }{x \times \frac{5x}{4} } = \frac{ \frac{20x - 5x}{4} }{ \frac{5x {}^{2} }{4} } = \frac{15x}{4} \times \frac{4}{5x {}^{2} } = \frac{3}{x}$