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Sagot :

Salut !

a) configuration triangle : AE/AC = AD/AB = DE/BC

   configuration papillon : FE/FB = FD/FC = DE/BC

b) FE/FB = DE/BC et DE/BC = AD/AB

   donc FE/FB = AD/AB = 2/(2+3)

   donc FE/FB = 2/5

  donc FE/4 = 2/5

  donc FE = 4 × 2/5 = 1,6 cm

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