x/(x^2-x-2) dx 的微积分

3个回答

  • 是求∫[x/(x^2-x-2)]dx吧! 若是这样,则方法如下:

    ∫[x/(x^2-x-2)]dx

    =∫{x/[(x-2)(x+1)]}dx

    =(1/3)∫{[(x+1)-(x-2)]/[(x-2)(x+1)]}dx

    =(1/3)∫[1/(x-2)]dx-(1/3)∫[1/(x+1)]dx

    =(1/3)ln|x-2|-(1/3)ln|x+1|+C.