根据 求导公式(y/x)'=(y'x-yx')/x² 得x/(x²-x+3)导数为 [x‘(x²-x+3) - x(x²-x+3)']/(x²-x+3)²=[(x²-x+3)-x(2x-1)]/(x²-x+3)²=(-x²+3)/(x²-x+3)²...