Răspunsuri

2014-04-16T14:24:47+03:00
X+y/x-y=3/5
5(x+y)=3(x-y)
5x+5y=3x-3y
5x-3x=-3y-5y
2x=-8y
x=-4y

20/100 *x- 3= 25/100 *y
x/5 -3=y/4   aducem la acelasi numitor
4x-60=5y
4*(-4y)-60=6y
-16y-6y=60
-22y=60
y=- 30/11
x=(-4)*(- 30/11)
x=120/11