Question

Daca x/y =3/5, atunci 3x - y/x + y =...

Answer 1

$\frac{x}{y} = \frac{3}{5}$

$\frac{3x - y}{x + y} =$

$x = \frac{3y}{4}$

$\frac{ \frac{9y}{4} - y}{ \frac{3y}{4} + y}$

$\frac{ \frac{5y}{4} }{ \frac{7y}{4} } =$

$\frac{5y}{4} \div \frac{7y}{4} = \frac{5y}{4} \times \frac{4}{7y}$

$= \frac{5}{7}$

Answer 2

x/y=3/5

x=3k

y=5k

(3x-y)/(x+y)=(3×3k-5k)/(3k+5k)=(9k-5k)/8k=4k/8k=1/2