求∫xln(x-1)dx不定积分
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分部积分,1/2x^2ln(x-1)-1/4x^2-1/2x-1/2ln(x-1)
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=1/2∫ln(x-1)dx^2
=1/2x^2ln(x-1)-1/2∫x^2d(ln(x-1))
=1/2x^2ln(x-1)-1/2∫x^2/(x-1)dx
=1/2x^2ln(x-1)-1/2∫(x^2-1+1)/(x-1)dx
=1/2x^2ln(x-1)-1/2∫(x+1+1/(x-1))dx
=1/2x^2ln(x-1)-1/4x^2-1/2x-1/2ln(x-1)
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