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2014-04-29T18:04:47+03:00
P = 420
P = 2(L + l )
L=2l + 18
420 = 2 (2l+18)+2l
420=4l +36 + 2l
420=6l + 36
6l =420 -36
6l=384
l=64
L=2l+18=2×64 +18=146
7 2 7