积分1/[x(x^11+4)]dx
积分1/[ x(x^11+4)]dx
∫1/[x(x^11+4)]dx＝∫x^10/[x^11(x^11+4)]dx＝1/44*∫[1/x^11－1/(x^11+4)]d（x^11）＝1/44*[lnx^11－ln(x^11+4)]+C＝1/44*ln(x^11/(x^11+4))+C