f(x)=x³-x²-x+af'(x)=3x²-2x-1令f'(x)=0,则(3x+1)(x-1)=0,x=-1/3或1x (-∞,-1/3) -1/3 (-1/3,1) 1 (1,+∞)f'(x) + 0 - 0 +f(x) 增 极大值 减 极小值 增∴f(x)极大值=f(-1/3)=(5/27)+af(x)极小值=f(1)...