Question

se stie
$\frac{x}{y} = \frac{2}{7} calculati$
$\frac{2x}{3y}$
$\frac{x + y}{y}$
$\frac{x}{y - x}$
$\frac{2x + 3y}{5y}$

Answer 1

Deci x/y=2/7-amplificam cu k=> x=2k y=7k
2x/3y=4k/21k -taiem k=> 2x/3y=4/21
x+y/y=9k/7k-taiem k=>x+y/y=9/7
x/y-x=2k/5k-taiem k=> x/y-x=2/5
2x+3y/5y=4k+21k/35k =25k/35-taiem k si simplifica cu 5=> 2x+3y/5y=5/7