若a等于根号2-1则a相反数是,a的倒数是?
问题描述：
若a等于根号2-1则a相反数是,a的倒数是?
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