xxx \(x\) xx x xxxxxxxx xxxxxxx, xxx xxx \(x_x,\xxxxx,x_x,x_x,\xxxxx,x_x\) xx xxxxxxxx xxxxxxxxxxx xxxxxx xxxxxxxxx, xxxx xxxxxxxxx xxxxxxxxxxx xx \([x,x]\). xxxxxx \(x=\xxx(x_x,\xxxxx,x_x)\) xxx \(x=\xxx(x_x,\xxxxx,x_x)\). xxxx xx \(\xxxxxx{x}(x+x\xxx x)\)?
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