0,(3)=3/9=1/3
0,25=25/100=1/4
0,2=2/10=1/5
{a;b;c} i.p. {1/3; 1/4; 1/5} si (a+b+c)/3=60
a/3=b/4=c/5=k; si a+b+c=60•3=180
a=3k; b=4k; c=5k
3k+4k+5k=180
12k=180 =>k=180/12=15
a=3•15=45
b=4•15=60
c=5•15=75
De retinut:
{a;b;c} d.p. {x; y; z}=> a/x=b/y=c/z=k
=> a=x•k; b=y•k; c=z•k
{a;b;c} i.p. {x; y; z}=> a•x=b•y=c•z=k
=> a=k/x; b=k/y; c=k/z
