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m.z. x=-√2 v x=√2 v x=1 v x=-3 (podwojne)
____-3_____-√2_____1____√2_____>x
+ + 0 + + 0 _ _ 0 + + 0 _ _
Odp. x∈ {-3} u <-√2, 1> u <√2,+∞)