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E3A Maths B PC 2006 ? Corrigé

Si b0 = b2, C2 donne a0 = ?a2 ainsi (a0 + a2)a1 + (b0 + b2)b1 = 2b0b1 = 0. Si b0 = ?b2, C2 donne a0 = a2 ainsi (a0 + a2)a1 + (b0 + b2)b1 = 2a0a1 = 0.