P=2*p=2*65=130m
a/3=b/4=c/6=x
a=3x;b=4x;c=6x
3x+4x+6x=130
13x=130
x=10
deci,a=3*10=30m; b=4*10=40m; c=6*10=60m
2)a/0,2=b/0,5=c/0,(3)=d/0,(6)=k
a=0,2k; b=0,5k; c=0,(3)k; d=0,(6)k
3*0,2k-0,(3)k+0,(6)k-0,5k=13
[tex]3* \frac{1}{5}k- \frac{1}{3}k+ \frac{2}{3}k- \frac{1}{2}k=13 \\ \frac{18k-10k+20k-15k}{30} = \frac{390}{30} \\ 13k=390 \\ k=30 \\ a=30*0,2=6 \\ b=0,5*30=10 \\ c=0,(3)*30=10 \\
d=0,(6)*30= 20[/tex]