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  • Utilisateur Brainly
2013-01-08T18:45:59+01:00

x            -inf                   1/2                  4                  +inf

2x-1                   -             0          +                  +

4-x                     +                        +        0        -

 

resultat             -                0         +       0            -

 

S=]-inf,1/2]U[4,+inf[

 

 

x            -inf                   1/5                 2/3                +inf

1-5x                   +            0          -                  -

3x-2                   -                        -        0         +

 

resultat             -                0         +       0            -

 

S=[1/5;2/3]