x xxxxxx xxxxx xxxxxx x xxx-xxxxx xxxx \(x_x\), xxxxxxxx xx \(x_x=x\). xxxx xxxxxxxxx \(\xxxxx x_x\) xx xxxxxx \(+x\) xx \(-x\), xxxx xxx xxxxx xxxxxxxxx xxxxxxx xxxxxx xx xx xxxxxx. xxxxxxxxxxx xx xxx xxxxxxxx xxxxxxxxx, xxxx xxxxxxxxxx xxxxxxxxx xxxxxxx xxx xxxxxxxxx xxxx xxxxxxxxxxx \(x/x\) xxx xxxxxxxx xx xxxx xxxxxxxxxxx \(x/x\), xxxxxxxxxxxxx xx xxx xxxxxxx xxxxxxx. xxx xxxxxxxx xxxxx xx \(\xxx=\xxx\{x\xxx x:|x_x|=x\}\).
(x) xxxx xx \(\xxxxxx{x}[\xxx]\)?
(x) xxxxx \(\xxxxx x_x=+x\), xxxx xx xxx xxxxxxxxxxx xx xxxxxxx \(+x\) xxxxxx \(-x\)?
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