Question

函數y=-(-1≤x≤0)的反函數是 (    )

A.y=(0≤x≤1)                    B.y=(-1≤x≤0)

C.y=-(-1≤x≤0)                  D.y=-(0≤x≤1)

Answer 1

C

解析:由y=-得y²=1-x²,∴x²=1-y².

∵-1≤x≤0,∴x=-.

又由y=-(-1≤x≤0)得-1≤y≤0,

∴函數y=-(-1≤x≤0)的反函數是y=-(-1≤x≤0).故選C.