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Meilleure réponse !
2014-05-02T16:39:34+02:00
Bonjour

7 -2x ≤5
-2x ≤ 5 -7
-2x≤ -2
x ≥ 1

7 -2x <- 1
-2x < -1 -7
-2x < -8
x >8/2
x >4

7 -2x/3 >1
21 - 2x >3
-2x > 3 -21
-2x > -18
x < 9

3 -x/2 ≤5
6 - x ≤10
-x≤10-6
-x ≤ 4
x≥ -4

2(3 +5n)<10
6 + 10n < 10
10n < 10 -6
10n < 4
n < 4/10
n< 2/5

2((3 -5n) <10
6 - 10n < 10
-10n < 10 -6
-10n < 4
n > - 2/5

2(3+5n)<-10
6+10n < -10
10n < -10-6
10n <-16
n < -16/10
n < - 8/5

2(3 -5n) > 10
6 - 10n > 10
-10n > 10 +6
-10n > 16
n > - 16/10
n > - 8/5