jeśli x < 0, wówczas |x- pierwiastek (x-1) do drugiej | wynosi:
|x-√(x-1)²|=
|x-|x-1||=
|x-(-x+1)|=
|x+x-1|=
|2x-1|=-2x+1
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|x-√(x-1)²|=
|x-|x-1||=
|x-(-x+1)|=
|x+x-1|=
|2x-1|=-2x+1