函数y=−x2(x≤0)y=−x2(x≤0)的反函数是( )。单项选择题选项:
A.y=−x−−√(x≥0)y=−x(x≥0) B.y=−x−−−√(x≤0)y=−x(x≤0) C.y=−−x−−−√(x≤0)y=−−x(x≤0) D.y=−|x|y=−|x|正确答案C
函数y=−x2(x≤0)y=−x2(x≤0)的反函数是( )。单项选择题选项:
A.y=−x−−√(x≥0)y=−x(x≥0) B.y=−x−−−√(x≤0)y=−x(x≤0) C.y=−−x−−−√(x≤0)y=−−x(x≤0) D.y=−|x|y=−|x|正确答案C