七贤阁
幼苗
共回答了16个问题采纳率:81.3% 举报
本题共有六种答案,只要给出其中一种答案,均正确.
a 2 -1
ab-b =
(a+1)(a-1)
b(a-1) =
a+1
b ;
a 2 -1
b+ab =
(a+1)(a-1)
b(1+a) =
a-1
b ;
ab-b
a 2 -1 =
b(a-1)
(a+1)(a-1) =
b
a+1 ;
ab-b
b+ab =
b(a-1)
(a+1)b =
a-1
a+1 ;
b+ab
a 2 -1 =
b(a+1)
(a+1)(a-1) =
b
a-1 ;
b+ab
ab-b =
b(1+a)
b(a-1) =
a+1
a-1 .
1年前
3