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Sagot :

a

AE/AD=AB/AC=EB/DC

AB/AC=EB/x

2/5=3/x

x=(5×3)/2

x=7,5cm

b

RV/RC=RB/RA=VB/AC

RV/x=VB/AC

10/x=2/3

x=(10×3)/2

x=15cm

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