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Rezolvati in R inecuatiile:
-3x+2>(egal) -7
2x+1<(egal) 11
5x+11< -7


Răspuns :

-3x+2>=-7   => -3x>=-9  =>  x<=-3  => x ∈ (-∞;3]


2x+1<=11  =>  2x<=10  =>  x<=5  =>  x∈(-∞;5]

5x+11<-7  =>  5x<-18  =>  x<-18/5  => x∈(-∞;-18/5)