下列说法正确的是[]A.实数包括正实数和负实数B.任何实数都有相反数C.无理数就是开方开不尽的数D.绝对值等于本身的数是0-八年级数学

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  • 实数的分类:
    (1)按定义分类:
                                                正整数
                                  整数 {    零
                                                 负整数

                 有理数{                                     }有限小数或无限循环小数
                                                 真分数
                                   分数{
    实数{                                 负分数

                                        正无理数
                      无理数{                      }无限不循环小数
                                        负无理数


    (2)按性质分类:
                                                         正整数
                                    正有理数{
                 正实数{                        正分数
                                    正无理数                          

    实数{   零                                 负整数
                                   负有理数{
                 负实数{                       负分数                 
                                   负无理数