Răspuns :
P=2L+2 l
2L/8 +2 l/5 =2L +2 L/8+5 =130*13 =10
2L/8 =10 ; 2L =8*10 =80 ; L =80:2 =40 cm
2 L/5 =10 ; 2 l =5*10 =50 ; l =50 :2 =25 cm
2L/8 +2 l/5 =2L +2 L/8+5 =130*13 =10
2L/8 =10 ; 2L =8*10 =80 ; L =80:2 =40 cm
2 L/5 =10 ; 2 l =5*10 =50 ; l =50 :2 =25 cm