设函数f(x)在 (-infty ,+infty ) 上连续,且 (x)=(x)^2-x(int )_(0)^1f(x)dx, 则f(x)为 (-|||-A. ^2-dfrac (2)(9)x B. ^2+dfrac (2)(9)x C. ^2-dfrac (1)(9)x D. ^2+dfrac (1)(9)x