计算:(a-b)2n-1+2(b-a)2n+(a-b)2n+1.
问题描述:
计算:(a-b)2n-1+2(b-a)2n+(a-b)2n+1.
答
(a-b)2n-1+2(b-a)2n+(a-b)2n+1
=(a-b)2n-1[1-2(a-b)+(a-b)2]
=(a-b)2n-1(a-b-1)2.