Răspuns:
x+y=17=>x=17-y
x/y=3/5
inlocuim pe x
(17-y)/y=3/5 facem produsul mezilor cu al extremilor
5(17-y)=3y=>85-5y=3y=>85=3y+5y=>y=85/8
x=⁸⁾17-85/8=>(136-85)/8=>x=51/8
x-y=51/8-85/8=>x-y=-34/8⁽²= -17/4
x+y=17
x/y=3/5
x=3k
y=5k
3k+5k=17
8k=17
k=17/8
x=3×17/8
x=51/8
y=5×17/8
y=85/8
x-y=
=51/8-85/8=
=-34/8=-17/4
