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2x²-x+2x-1≤0
x(2x-1)+(2x-1)≤0
(2x-1)(x+1)≤0
m.z, x=1/2 v x=-1
_______-1______1/2_____>x
+ + 0 _ _ 0 + +
Odp. x∈<-1, 1/2>