P=140m
a)
L/ l=3 rest2=>L+2m=3 l=>L=3 l+2m
2x(3l+2m)+2 l=140m
6 l+4m+2l=140m
8 l=140-4m
8l=136m
l=136/8m
l=17m
L=3x17m+2m
L=51m+2m
L=53m
2x53m+2x17m=140m
106+34m=140m
b)L= l+2
2x(l+2)+2 l=140m
4l+4=140m
4l=140m-4m
4 l=136m
l=136/4
l=34m
L=34+2m
L=36m
2x36m+2x34m=140m
72m+68m=140m
c)L- l=l/3
L=l+l/3
2x(l+l/3)+2l=140m
2+2l/3+2l=140m
4l +2l/3=140m
aducem la acelasi numitor
12 +2 l=140x3m
14 l=420m
l=420/14m
l=30m
L=30+30/3m
L=40m
L-l= l/3
40m-30m=30m/3
10m=10m
P=2x40m+2x30m
P=140m
l=
