A.a＞b＞                                     B.a＞＞b

C.a＞＞b＞                                    D.a＞＞＞b

A.x＞y                                                            B.x=y

C.x＜y                                                            D.与m、n的取值有关

A.a＞b                         B.ab(a－b)＜0              C.0＜a＜b                    D.a＜b

A.＜＜1                                            B.≥

C.≤≤1                                            D.1＜＜

A.＜＜                                          B.＜＜

C.＜＜                                          D.以上均有可能

A.lg(x²+2)≥lg(2|x|+1)                                      B.x²+1≥x

C.x²+1＜1                                                        D.x²+4≥4x

A.(a²+b²)(c²+d²)≥(ac+bd)²                                         B.(a²+b²)(c²+d²)＞(ac+bd)²

C.(a²+b²)(c²+d²)≤(ac+bd)²                                        D.(a²+b²)(c²+d²)＜(ac+bd)²

A.a+≥b+                                                B.a+＞b+

C.a+≤b+                                                D.a+＜b+