Question

分解公因式

y^3-2y+1=0
怎么把它变成
(y-1)(y^2+y-1)=0

方法

Answer 1

y^3-2y+1=0

(y^3-1)-(2y-2)=0
(y-1)(y^2+y+1)-2(y-1)=0
(y-1)(y^2+y-1)=0

Answer 2

y^3-2y+1=0
(y^3-1)-(2y-2)=0
(y-1)(y^2+y+1)-2(y-1)=0
(y-1)(y^2+y-1)=0