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Besoin d'aide pour résoudre ce problème de C.M


delio
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Bonjour les amis,   HELP, HELP!!!

 

je n'arrive pas à calculer (voir pièces jointes) :  

 

 1- LA SECTION ET  LA LONGUEUR DU JARRET SELON CM 66

 

 2-  ET LA CLEF DE FAÎTAGE SELON CM 66

 

MERCI!

 

 

 [attachment=6563:clef de faitage.PNG][attachment=6564:jarret.PNG]

 

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