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2014-01-29T17:28:32+02:00
DE||AB => DC/AC=EC/BC=DE/AB
AC=AD+DC=3+6=9
6/9=EC/15=DE/12
EC=6*15/9=10
DE=6*12/9=8
P=DC+DE+EC=10+8+6=24
iti multumesc foarte mult Niwa
muuuuuuuuuuuuuult!!