A.＞和均不能成立

B.＞和＞均不能成立

C.不等式和()²＞(b+)²均不能成立

D.不等式和(a+)²＞(b+)²均不能成立

A.18                 B.6                C.2                 D.2

A.{x|-1≤x≤1}                                B.{x|-2≤x≤2}

C.{x|0≤x≤2}                                 D.{x|-2≤x≤0}

A.a=±2                                    B.a=b=±2

C.ab=4且|a|≤2                              D.ab=4且|a|≥2

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

A.           B.           C.            D.

A.              B.              C.              D.

A.x+                                               B.

C.log_ax+log_xa(a＞0,x＞0且a≠1,x≠1)                       D.3^-x+3^x(x＞0)

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