当a大于或等于2求证根号a+1减根号a小于根号a-1减根号1a-2
问题描述:
当a大于或等于2求证根号a+1减根号a小于根号a-1减根号1a-2
答
(√a+1-√a)-(√a-1-√a-2 )
=1/(√a+1 + √a)-1/(√a-1+√a-2)比较分母
(√a+1 + a)>(√a-1+√a-2)>=1
0