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Post at 2012-1-13 14:29

2、平方根,又叫二次方根,表示为〔√ ̄〕,其中属于非负数的平方根称之为算术平方根。

3、一个正数有两个实平方根,它们互为相反数;0只有一个平方根,就是0本身;负数有两个共轭的纯虚平方根。

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5、例:25的平方根是5;2的平方根约为1.41421356237;Pi(π)的平方根约为1.77245385102

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