Răspuns:
x/y=0,(4)=>x/y=4/9=>x=4y/9
(5x+3y) / (11y-4x)=
( 5·4y/9+3y) / (11y-4·4y/9)=
(20y/9+⁹⁾3y) / (⁹⁾11y-16y/9)=
(20y+27y)/(99y-16y)=
47y/83y=47/83
x/y = 0,(4)
0,(4) = 4/9
x/y = 4/9=> 4y = 9 x
(5x + 3y ) / (11 y - 4x ) ( * 4
(20 x + 12 y ) / ( 44 y - 16 x )
(20x + 9 * 3x ) / ( 44 y - 16 x )
(20 x + 27 x ) / ( 99 x - 16 x )
47 x / 83 x = 43 / 83