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2014-08-12T16:34:55+03:00
L;l    dp cu 3;4

l/3 =L/4=k

l=3k
L=4k

P=2L+2l

P=2*4k+2*3k
P=8k+6k
P=14k

14k=42
k=3

l=3*3=9
L=4*3=12

A=L*l=9*12= 108
6 4 6