Răspuns :
P=2(L+l)=220
L+l=220:2=110
L+l=110
L-l=10
(reducem) 2L=120
L=60
l=110-60=50
L+l=220:2=110
L+l=110
L-l=10
(reducem) 2L=120
L=60
l=110-60=50
P=2l+2L=220
P=22(L-l)
2L+2l=22L-22l
2L-22L=-22l-2l
-20L=-24l
20L=24l
L=24l/20= 12l/10= 6l/5
2l+2* 6l/5=220
2l+12l/5=220 aducem la acelasi numitor
10l+12l=1100
22l=1100
l=50
L=6*50/5
L=6*10=60
P=22(L-l)
2L+2l=22L-22l
2L-22L=-22l-2l
-20L=-24l
20L=24l
L=24l/20= 12l/10= 6l/5
2l+2* 6l/5=220
2l+12l/5=220 aducem la acelasi numitor
10l+12l=1100
22l=1100
l=50
L=6*50/5
L=6*10=60