A.(x-a)(x-b)＜0与a＜x＜b                   B.x＜|x-m|与x＜x-m

C.≥0与f(x)g(x)≥0                   D.|x-p|＞|x-q|与(x-p)²＞(x-q)²

A.充分不必要                              B.必要不充分

C.充要                                       D.既不充分也不必要

A.(-a)²＜(-ab²)²                                              B.(-a)^-1＞(-ab²)^-1

C.                        D.()^-a＞

①d＞c；②a+b=c+d；③a+d＜b+c.

请将a、b、c、d按照从大到小的次序排列,并证明你的结论.

A.+≥2                               B.a²+b²≥2ab

C.≥a+b                            D.+≥2+

A.a＞bac²＞bc²                                             B.a＞b,a²+b²≠0a^-1＜b^-1 

C.a³＞b³,ab＞0a^-1＜b^-1                                D.a²＞b²,ab＞0a^-1＜b^-1

A.0                    B.1                    C.2                     D.3