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+1)(a-1)/(a+1)^1/2=(a-1)(a+1)^1/2
答
a^-1 = (a+1)(a-1) = (a+1)(√a+1)(√a-1)
原式= (a+1)(√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）
答
a^-1 = (a+1)(a-1) = (a+1)(√a+1)(√a-1)
原式= (a+1)(√a-1)
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