Răspunsuri

2014-10-08T23:23:58+03:00
L-latime
L-lungime
P=2(L+l)
l=a
L=a+1
30=2(a+a+1)
2(2a+1)=30
4a+2=30
4a=30-2
a=28/4
a=7
latimea=7 cm
L=7+1=8cm