Răspunsuri

2014-03-11T19:31:24+02:00
AB/DE = BC/EF = AC/DF = AB+BC+AC/DE+EF+DF
7/DE = 8/EF = 10/DF = 25/75 = 1/3
DE = 7 · 3 = 21
EF = 8 · 3 = 24
DF = 10 · 3 =30
1 5 1