найти производную 3x^2-3/x+1

3x^2-3/x+1y`=(6x(x+1)-(3x^2-3))/(x+1)^2 = (6x^2+6x-3x^2+3)/(x+1)^2 = (3x^2+6x+3)/(x+1)^2 = 3(x^2+2x+1)/(x+1)^2