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2014-08-21T12:50:50+03:00
L=a
L=a+2

L*l=80

a(a+2)=80

a²+2a-80=0

(a²+2a+1) -81=0

[(a+1)-9][(a+1)+9]=0

(a-8)(a+10)=90

a-8=0       a+10=0
a=8           a= -10∉N

l=8
L=8+2
L=10

P=2l+2L=2*8+2*10=16+20=36
2 5 2