因式分解:(x+y)ⁿ+² —2(x+y)ⁿ+¹ +(x+y)ⁿ

问题描述:

因式分解:(x+y)ⁿ+² —2(x+y)ⁿ+¹ +(x+y)ⁿ

(x+y)ⁿ+² —2(x+y)ⁿ+¹ +(x+y)ⁿ
=(x+y)ⁿ[(x+y)² —2(x+y) +1 ]
=(x+y)ⁿ(x+y-1)²(x+y)ⁿ+²=(x+y)ⁿ(x+y)²;(x+y)ⁿ+¹=(x+y)ⁿ(x+y);因此可以将(x+y)ⁿ提出来