Question

Математике
27у^3 +1
———— черта дроби
1- 9 у^2

Answer 1

$frac{27y^3+1}{1-9y^2}= frac{(3y)^3+1^3}{1^2-(3y)^2}= frac{(3y+1)(9y^2-3y+1)}{(1-3y)(1+3y)}= frac{9y^2-3y+1}{1-3y}$