hey daca 5x supra 6 y = 0.3125 calculati valoarea raportului 19 x-7y supra 5x +3y (cu tot cu rezolvare va rog )MERSI MULT

Răspuns :

5x/6y=0,3125    
5x/6y=3125/10000
5x/6y=5/16
x/3y=1/8
y=8x/3

(19x-7y)/(5x+3y)=
=(19x-7×8x/3)/(5x+3×8x/3)=
=(19-56/3)/(5+8)=
=[(57-56)/3 ]/13
=1/39