Bartlett Hardy
01/26/2024 · Middle School

Soit ABC un triangle On considère les points \( \mathrm{D}, \mathrm{E} \) et F tels que : \( \overrightarrow{B D}=\frac{2}{3} \overrightarrow{B C} ; \overrightarrow{A E}=-2 \overrightarrow{A D} \) et \( \overrightarrow{B F}=\frac{3}{5} \overrightarrow{B E} \) 1) construire la figùre 2) écrire \( \overrightarrow{E A} \) et \( \overrightarrow{F B} \) en \( f \) onction \( \overrightarrow{A B} \) et \( \overrightarrow{B C} \) 3) a) montrer que les points \( A ; F \) et \( C \) sont alignés b) en déduire que \( (A C) \) et \( (B E) \) se coupent en \( F \) 4) soit \( M \) un point tel que \( : \overrightarrow{B M}=\frac{2}{3} \overrightarrow{B A} \) Montrer que : \( (D M) / /(A C) \)

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1) Construire le triangle \( ABC \) et placer \( D \), \( E \), et \( F \) selon les relations données. 2) Écrire \( \overrightarrow{E A} \) et \( \overrightarrow{F B} \) en fonction de \( \overrightarrow{A B} \) et \( \overrightarrow{B C} \). 3) a) Montrer que \( A \), \( F \), et \( C \) sont alignés. b) Déduire que \( (A C) \) et \( (B E) \) se coupent en \( F \). 4) Montrer que \( (D M) \) est parallèle à \( (A C) \).

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