(a-b)^2n-1·[(b-a)^n]^2(n为正整数)
问题描述:
(a-b)^2n-1·[(b-a)^n]^2(n为正整数)
答
(a-b)^(2n-1)·[(b-a)^n]^2
=(a-b)^(2n-1)·[(a-b)^n]^2
=(a-b)^(2n-1)·(a-b)^2n
=(a-b)^(2n-1+2n)
=(a-b)^(4n-1)为什么(a-b)^(2n-1)·[(b-a)^n]^2=(a-b)^(2n-1)·[(a-b)^n]^2不应该是(a-b)^(2n-1)·[(b-a)^n]^2=(a-b)^(2n-1)·[-(a-b)^n]^2[-(a-b)^n]^2 =(-1)^2*[(a-b)^n]^2 =(a-b)^2n