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DE=10
CE25
DF=28
Hallamos:
I)C-D-E = CD+DE
25 = CD + 10
CD = 15
II) D-E-F = DE + EF
28 = 10 + EF
EF = 18
Suma de CF:
CD+ DE + EF
15 + 10 + 18 = 43
Rpta: 43