化简 a^2-1/根号下a+1
问题描述:
化简 a^2-1/根号下a+1
答
(a^2-1)/(√a+1 )
=(a+1)(a-1)/(√a+1 )
=(a+1)(√a-1)(√a+1)/(√a+1 )
=(a+1)(√a-1)