\( SABCD \) est une pyramide de sommet \( S \) dont la base est le parallélogramme
\( ABCD \) de centre \( G \). \( IJKL \) sont respectivement les milieux de \( [AB] \),
\( [BC] \), \( [CD] \) et \( [DA] \).
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Exprimer le vecteur \( \overrightarrow{ AD }+\overrightarrow{ LA }+\overrightarrow{ CK } \) en fonction d'un seul
autre vecteur contenant la lettre \( I \).
On donnera uniquement le vecteur correspondant.