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(x+1)²-(x-2)²>4-x Multumesc!



Răspuns :

x²+x+1-x²+4x-4>x-4
5x-3>x-4
4x>-1
x>-1/4
x²+2x+1-x²+4x-4-4+x>0
7x-7>0
7(x-1)>0
x-1>0
x>1
x∈(1,+α)