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conjugé complexe.md
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conjugé complexe.md
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up::[[nombre complexe]]
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#maths/analyse/complexes
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---
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Soit $z = a+ib$ un [[nombre complexe]].
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Le _complexe conjugué_ $z$ est noté $\overline z$, et est le complexe tel que :
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$\overline{z} = a-ib$
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# Propriétés
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La conjuguaison complexe est distributive sur l'addition, la soustraction, la multiplication et la division :
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- $\overline{z+z'} = \overline z + \overline{z'}$
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- $\overline{z\times z'} = \overline z \times \overline{z'}$
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- $\overline{\dfrac z{z'}} = \dfrac{\overline z}{\overline{z'}}$ (si $z'\neq 0$)
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