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Secondary V • 9mo.

Bonjours, dans ce numéro, j'essaie de trouver la réponse en faisant Fgx= cos1.5•80•9.8 ca ma donné 783N. La réponse est 20,5N , quelqu'un peut m'expliquer svp? Merci d'avance (numero 6b)

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