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On a
det(A)=3 a (9-a²) et A non inversible Ssi ( a=0 ou a=3)
det(A)=3 a (9-a²) et A non inversible Ssi ( a=0 ou a=-3 ou a=3)
det(A)=9 a² (3-a) et A non inversible Ssi ( a=0 ou a=3)
det(A)=3 a² (9-a) et A non inversible Ssi ( a=0 ou a=9)
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