下列说法正确的是()A.有理数都是实数B.实数都是有理数C.带根号的数都是无理数D.无理数都是开方开不尽的数-数学

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                               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