A.a≤1                B.a≥2            C.a≤1或a≥2            D.1≤a≤2

(1)求f(x)的反函数f^-1(x),并求出反函数的定义域;

(2)判断并证明f^-1(x)的单调性.

(1)求它的反函数;

(2)求使f^-1(x)=f(x)的实数a的值;

(3)当a=-1时,求f^-1(2).

A.a＜b                   B.a=b                 C.a＞b                  D.无法确定

A.［0,+∞)             B.(-∞,0]             C.［-4,4］              D.［2,4］

(1)y=-(-1≤x＜0);

(2)y=-x²-2x+1(1≤x≤2);

(3)y=