Réponses

2014-10-17T09:39:49+02:00
2n+3>2(2n-1)
2n+3>4n-2
3+2>4n-2n
5>2n
n<5/2

-3(2n+1)>-20-3n
-6n-3>-20-3n
20-3>6n-3n
17>3n
n<17/3