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Determinati cifra x astfel incat: a)-254<-25x b) -x3mai mic sau egal-51

Răspuns :

a)-254<-25x <=> 25x<254 =>x<254/25 =>x<10,16 =>x∈(-∞;10,16)
b)-x³≤-51 <=> x³≥51 =>x≥∛51 =>x∈[∛51,+∞)