(x^5+x^4-8)/(x^3-x)
=[(x^5-x^3)+(x^4-x^2)+(x^3-x)+(x^2+x-8)]/(x^3-x)
=[x^2(x^3-x)+x(x^3-x)+(x^3-x)+(x^2+x-8)]/(x^3-x)
=[(x^3-x)(x^2+x+1)+(x^2+x-8)]/(x^3-x)
=x^2+x+1+(x^2+x-8)/(x^3-x)
=x^2+x+1+[(x^2-1)+(x-7)]/[x(x^2-1)]
=x^2+x+1+(x^2-1)/[x(x^2-1)]+(x-7)/[x(x^2-1)]
=x^2+x+1+1/x+(x-7)/[x(x+1)(x-1)]
=x^2+x+1+1/x+(1/2)[(x-7)/x][1/(x-1)-1/(x+1)]
=x^2+x+1+1/x+(1/2)(x-7)/[x(x-1)]-(1/2)(x-7)/[x(x+1)]
=x^2+x+1+1/x+{(1/2)/x-3/[x(x-1)]}-{(1/2)/x+4/[x(x+1)]}
=x^2+x+1+1/x-3[1/(x-1)-1/x]+4[1/x-1/(x+1)]
=x^2+x+1+1/x-3/(x-1)+3/x+4/x-4/(x+1)
=x^2+x+1+8/x-3/(x-1)-4/(x+1)。