Réponse :
Explications étape par étape
Bonsoir
(-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...(-)..||....(+)......
[tex]x \in ]-\infty ; -1/4] U ]1 ; +\infty[[/tex]
(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.....(-).......
[tex]x \in ]1/6 ; 1][/tex]
