Răspuns :
l=1/3*L
(1/3*l+l)*2=80cm
1/3*l+l=40 cm
l/3+l=40cm
4l=120cm
l=120:4=30cm
L=1/3*l=1/3*30=10cm
(1/3*l+l)*2=80cm
1/3*l+l=40 cm
l/3+l=40cm
4l=120cm
l=120:4=30cm
L=1/3*l=1/3*30=10cm
Rezolvarea problemei:
(1/3*L+L)*2=80
4L=120
L=30
l= 1/3*30=10
Sper că te-am ajutat.