带根号的,不好书写,有照片, 请问是怎么判断出的?

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带根号的,不好书写,有照片, 请问是怎么判断出的?
带根号的,不好书写,有照片,

 
请问是怎么判断出
的?

带根号的,不好书写,有照片, 请问是怎么判断出的?
                                                                                                                                                                                                                                                                                                                                                                          

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

x1>0 x2>0
x1^2

因为x1 x2都大于0.所以x1<根号{x1^2+1},x2<根号{x2^2+1},所以0