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2014-04-28T17:03:01+03:00
L+L+l+l=420
L=4l

4l+4l+l+l=420
10l=420
l=420:10
l=42

L=4*42
l=168
2014-04-28T17:24:14+03:00
L=4l
P= 2(L + l)
420= 2(4l + l)
420=2 x 5l
420=10l rezulta ca l=42
deci L=4x42= 168.
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