Réponse :

Explications étape par étape

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(-4x - 1)/(-x + 1) >> 0

-x + 1 # 0

x # 1

-4x - 1 = 0

4x = -1

x = -1/4

x.........|-inf......-1/4.......1........+inf

-x + 1..|......(+).........(+).o...(-)........

-4x - 1 |......(+)...o...(-)........(-).......

Ineq...|.......(+)...o...(-)..||....(+)......

(x - 1)/(-6x + 1) >> 0

-6x + 1 # 0

6x # 1

x # 1/6

x - 1 = 0

x = 1

x............|-inf..........1/6.........1..........+inf

x - 1.......|.......(-)............(-)....o....(+).......

-6x + 1..|.......(+)......o...(-)...........(-).......

Ineq.....|........(-)......||....(+)...o.....(-).......