(1-1/(a+1))/(a平方-a)/(a+1)其中a＝1+根号3先 化简再求值
问题描述：
(1-1/(a+1))/(a平方-a)/(a+1)其中a＝1+根号3先 化简再求值
答
(1-1/(a+1))/[(a^2-a)/(a+1)]
=(a/(a+1))/[a(a-1)/(a+1)]
=(a)/[a(a-1)]
=1/(a-1)
a＝1+根号3代入
1/(1+根号3 -1)
=1/根号3
=0.577