点P在数轴上和原点相距3单位,点Q在数轴和原点相距2个单位,且点Q在点P左边,则P、Q之间的距离为______.-数学

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                                    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