∫ xln（x-1）dx
问题描述：
∫ xln（x-1）dx
答
∫ln(x-1)d(x方/2)
=x方/2 ×ln(x-1)-1/2∫x方/(x-1)dx
=1/2x方ln(x-1)-1/2∫(x+1) +1/(x-1)dx
=1/2x方ln(x-1)-1/2(x+1)方 -ln(x-1)+c