Bonjour,
3.a ) PA = PB + BA (relation de Chasles)
PA = -BP - AB
PA = - (½ AB) - AB
PA = -½ AB - 2/2 AB
PA = -3/2 AB
b ) PS = PA + AS = -3/2 AB + ½ DA = -3/2 AB - ½ AD
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Bonjour,
3.a ) PA = PB + BA (relation de Chasles)
PA = -BP - AB
PA = - (½ AB) - AB
PA = -½ AB - 2/2 AB
PA = -3/2 AB
b ) PS = PA + AS = -3/2 AB + ½ DA = -3/2 AB - ½ AD