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2014-04-23T16:13:13+03:00
2014-04-23T16:21:02+03:00
P=60+L
L=3l
2(l+L)=60+L
2(l+3l)=60+3l
8l=60+3l
5l=60
l=16
L=48
P=2(16+48)=2*64=128
semiperimetrul p/2=128/2=64
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