ساده شده عبارت ${{\mathop x\nolimits^5 - x} \over {\mathop x\nolimits^3 - 2\mathop x\nolimits^2 + x}}$ کدام است؟
1 )
${{(x - 1)(\mathop x\nolimits^2 - 1)} \over {(x + 1)}}$
2 )
${{(x - 1)(\mathop x\nolimits^2 + 1)} \over {(x + 1)}}$
${{(x + 1)(\mathop x\nolimits^2 + 1)} \over {(x - 1)}}$
4 )
${{(x+ 1)(\mathop x\nolimits^2 - 1)} \over {(x - 1)}}$