若a等于根号2-1则a相反数是,a的倒数是?_数学解答

若a等于根号2-1则a相反数是,a的倒数是?

人气：474 ℃　时间：2020-06-16 07:37:27

解答

a=-(√2-1)
=-√2+1
a的倒数是
1/(-√2+1)
=(√2+1)/[(-√2+1)(√2+1)]
=(√2+1)/(1-2)
=-(√2+1)
=-1-√2