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(x-3)(x-2)(x+2)≥0
_____-2_______2____3________>
_ _ 0 + + + 0 _ _ 0 + + +
D=<-2,2> u <3,+∞)
b)
2x(3x-1)≠0
x≠0 i x≠1/3
D=R\{0, 1/3}