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九的算术平方根是多少?
更新时间： 2021-03-11 05:24:27  

1、若一个正数x的平方等于a，即x^2=a，则这个正数x为a的算术平方根(arithmetic square root）。a的算术平方根记作√￣a，读作“根号a”，a叫做被开方数（radicand）。

2、9的平方根为±3 ；9的算术平方根为3，正数的平方根都是前面加±，算术平方根全部都是非负数（0也在内，√￣0=0）

关键词： 算术 平方根 多少

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