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bonsoir

n - 5 < 8

n < 8 + 5

n < 13

n + 8 < 5

n < 5 - 8

n < - 3

n + 5 < 8

n < 8 - 5

n < 3

n - 8 < 5

n < 5 + 8

n < 13

continue

Réponse :

Explications étape par étape

Bonsoir

n - 5 < 8 => n < 8 + 5 => n < 13

n < 3

n < 13

n + 8 < 5 => n < 5 - 8 => n < -3

n + 5 < 8 => n < 8 - 5 => n < 3

n < -3

n - 8 < 5 => n < 5 + 8 => n < 13

n - 5 < -8 => n < -8 + 5 => n < -3

Exercice 39 :

-5n < 20 => -20 < 5n => n > -20/5 => n > -4

n < 4

n < 25

5n < 20 => n < 20/5 => n < 4

5n < -20 => n < -20/5 => n < -4

-5n < -20 => 20 < 5n => n > 20/5 => n > 4

n > 4

n > -4

n < -4

n > 25