adica d.p cu inversele lor, deci cu numerele
5/2=2,5, 7/2=3.5, 5/2=2,5 si 1/2=0,5
adica , amplificand cu 10
cu 25 35 25 5
adica, impartind cu 5
5 7 5 si 1
x/5=y/7=z/5=t/1=(x+y+z+t)/(5+7+5+1)=360/18=20
x=z=5*20=100
y=7*20=140
t=1*20=20
as simplificat as that!!