原式=[(3x^4+3x²)-(11x³+11x)+(2x²+2)+2x+5]÷(x²+1)
=3x²-11x+2+(2x+5)/(x²+1)原式=[3x^2(x^2+1)-11x(x^2+1)+5(x^2+1)+2x+2]÷(x^2+1)=3x^2-11x+5+(2x+2)/(x^2+1)这样行不？x²系数自己看