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Cel mai inteligent răspuns!
2014-06-24T15:31:04+03:00
AB=100m
AC=20m
BC²= AC²+AB²=20²+100²=400+10000=10400
BC=20√26
O cincime dintre C si B este =CD= 20√26/5=4√26
BD=CB-CD=20√26-4√26=16√26
si comparam ΔBDE cu ΔBCA
BD/DE=DE/AC
16√26 / 20√26 =DE/ 20
16/20=DE/20
DE=20*16/20=16 m


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