Question

un dreptunchi are p 120 latimea find jumate din lungime care sunt laturile

Answer 1

P=120
l=L/2
P=2L+2l
120=2L+2L/2
4L/2+2L/2=120
6L/2=120
3L=120
L=120:3L=40
l=40:2=20
l=20

Answer 2

P=120
P=2(l+L)
L=2l
P=2(2l+l)
4l+2l=120
l=120:6=20
P=2(20+L)=40+2L
40+2L=120
2L=120-40=80
L=80:2=40
V:P=2(20+40)=40+80=120