Răspunsuri

2014-05-20T20:34:48+03:00
P=2l+2L=60

l=20% din 60
l=20/100*60
l=1/5*60
l=60/5
l=12

2(L+l)=60
L+l=30
L=30-12
L=18

A=L*l=18*12=216