(a*a/a-1)-a-1
=a*a/a-1-(a+1)
=(a*a)/(a-1)-( a+1)*(a-1)/(a-1)
=(a*a)/(a-1)-(a*a+1)/(a-1)
=(a*a-a*a+1)/(a-1)
=1/(a-1)
思考很累，打字很累，求采纳！！！！！！！！！！！！！
2a-1/a-1
1/(a-1)
内容全部来源于网络收集，如有侵权，请联系网站删除！
QQ：24596024