9.设函数 (x)=dfrac (1)(x) , (x)=1-x, 则 [ g(x)] = __-|||-A. https:/img.cdnjtzy.com/zyb_28ef82914cba21022739e1da900e4cb3.jpg-dfrac (1)(x) B. https:/img.cdnjtzy.com/zyb_28ef82914cba21022739e1da900e4cb3.jpg+dfrac (1)(x) C. dfrac (1)(1-x) D.x