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2014-03-18T17:24:24+02:00
L=(2*l+18)
P=2(l+L)=2l+2(2l+18)=2l+4l+36=6l+36=420 ⇒ 6l=420-36=384m ⇒ l=64 m
L=2*64+18=128+18 =146 m
verificare 420=2(64+146)=2*210
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