Упростите n^3-27/9n : n-3/27n^3

(n³-27)/9n : (n-3)/27n³=(n³-3³)/9n . 27n³/(n-3)==(n³-3³)/1 . 3n²/(n-3)==(n-3)(n²+3n+9).3n²/(n-3)==(n²+3n+9).3n²=3nˇ4 +9n³+27n²                          ============  (nˇ4=n.n.n.n)