Réponses

2013-01-08T00:53:28+01:00

b) x - 4 > 5x + 4 <=> x-5x > 4+4 <=> -4x > 8 <=> 4x < -8 <=> x<-2

c) 4 - x >  4x - 1 <=> 4+1> 4x+x <=> 5>5x <=> x<1

d) 5x - 2  <  4 - x <=> 6x < 6 <=> x<1

e) x - 1 < 3x + 1 <=> -2 < 2x <=> x> -1

f) 7.2x + 8.4 > 14.4x - 13.2 <=> 21.6>7.2x <=> x<3