bonjour aider moi svp
Soit x un nombre réel tel que x < 5.Pour chaque affirmation, dire si elle est vraie ou fausse.
1.) x – 7 ∈ [–2 ; +∞[
2.) –2x ∈ [–10 ; +∞[
3.) 3x + 4 ∈ [18 ; +∞[
4.) -1/2x+1∈ ] -∞; -1,5]
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