1) x-(3)/4*x^2+24*x+36 / ((x/3*x)-9 - (3)/x^2+3*x + x^2+(9)/27-3*x^2)
2) (15*x^6-527*x^5+978*x^4-2600*x^3+459*x^2-900*x)/(-20*x^4+36*x^3-104*x^2-36)
3) -x*(15*x^5/(5*x^4-9*x^3+26*x^2+9)-527*x^4/(5*x^4-9*x^3+26*x^2+9)+978*x^3/(5*x^4-9*x^3+26*x^2+9)-2600*x^2/(5*x^4-9*x^3+26*x^2+9)+459*x/(5*x^4-9*x^3+26*x^2+9)-900/(5*x^4-9*x^3+26*x^2+9))/4
или так
1)x-(3)/(4*x)^2+24*x+36 / ((x/(3*x))-9 - 3/x^2+3*x + x^2+(9)/27-3*x^2)
2) (2400*x^7-3600*x^6+10000*x^5-1746*x^4+3627*x^3-75*x^2-27)/(96*x^6-144*x^5+400*x^4+144*x^2)
3) (150*x^7-225*x^6+625*x^5-873*x^4/8+3627*x^3/16-75*x^2/16-27/16)/(x^2*(6*x^4-9*x^3+25*x^2+9))