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rezolvati in R inecuatia:2x<x la a doua

Răspuns :

2x<x^2
2x-x^2<0
x•(2x-x)<0



{x<0
{2-x>0

{x>0
{2-x<0



{x<0
{x<2

{x>0
{x>2



x€{-infinit, 0}
x€{2, +infinit}

x€《-infinit, 0》U 《2, +infinit》