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Cat face [2X-1]=3?Ssssssssssaaaaaaallllluuuut

Răspuns :

[2x-1]=3=.>2x-1∈[3 ,4)
2x-1≥3  => x≥2
2x-1<4=>x<5/2
2≤x<5/2 <=>
x∈[2 ,5/2)