根号5减根号1/5加1/2等于几?保留根号
问题描述：
根号5减根号1/5加1/2等于几?
保留根号
答
【（8√5）-5】/10
答
5^(1/2)-(1/5)^(1/2)+1/2
=5^(1/2)-(5^(-1))^(1/2)+1/2
=5^(1/2)-1/[5^(1/2)]+1/2
=[4*5^(1/2)]/5+1/2
答
5/4根号5加2/1