1个回答
展开全部
a^2+2a-15=0
a²+2a+1=16
(a+1)²=16
1/a+1 - a+2/a^2-1 / (a+1)(a+2)/a^-2a+1
=1/(a+1) -(a+2)/(a+1)(a-1) ×(a-1)²/(a+1)(a+2)
=1/(a+1)-(a-1)/(a+1)²
=(a+1-a+1)/(a+1)²
=2/(a+1)²
=2/16
=1/8
a²+2a+1=16
(a+1)²=16
1/a+1 - a+2/a^2-1 / (a+1)(a+2)/a^-2a+1
=1/(a+1) -(a+2)/(a+1)(a-1) ×(a-1)²/(a+1)(a+2)
=1/(a+1)-(a-1)/(a+1)²
=(a+1-a+1)/(a+1)²
=2/(a+1)²
=2/16
=1/8
本回答由提问者推荐
已赞过
已踩过<
评论
收起
你对这个回答的评价是？
推荐律师服务：
若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询
