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9. Rezolvă:
a) (x + 1)(x + 5) < x2 + 17, unde a E R;
b) (x + 1)(x + 5) +17, unde € N
; c) 22 - 20 > (+4)2, unde E N;
d) 2 - 20 > (2 + 4), unde eR;
e) (x - 2)2 – (x – 3)(x + 1)
Ajutor vă rog​