方根
拉数学中，若一个数b为数a个n次方根，则 b n = a =a} 。当提及实数a个n次方根个辰光，假定想要个是迭个数个主n次方根，各么渠就可以用根号（ x x}}} 表示成 a n ]}} 。例如：1024个主10次方根为2，就可以记作 1024 10 = 2 ]}=2} 。当n=2辰光，则n可以省略。
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