分三段,0到1,1到2,2到4.每一段的绝对值加起来。得3分之23
原式=不定积分(x^2)/(x^2-3x+2)dx=不定积分(x^2-3x+2+3x-2)/(x^2-3x+2)dx=不定积分1dx+不定积分[3(x-1)+1]/(x-2)(x-1)dx=x+不定积分3/(x-2)dx+不定积分1/(x-2)(x-1)dx=x+3ln(x-2)+ln[(x-2)/(x-1)]+C=x+ln[(x-2)^4/(x-1)]+C