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Sagot :

[tex]g^{2} =81[/tex]

[tex]g^{2} =-81=0[/tex]

[tex](g-9)(g+9)=0[/tex]

[tex]g-9=0[/tex]

[tex]g+9=0[/tex]

[tex]g_{1} =9\\ g_{2} =-9[/tex]

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