问题
解答题
先化简,再求值:(1+
|
答案
原式=
÷a-1+1 a-1 a(a+1)(a-1) (a-1)2
=
•a a-1 (a-1)2 a(a+1)(a-1)
=
,1 a+1
当a=
-1时,原式=3
=1
-1+13
.3 3
先化简,再求值:(1+
|
原式=
÷a-1+1 a-1 a(a+1)(a-1) (a-1)2
=
•a a-1 (a-1)2 a(a+1)(a-1)
=
,1 a+1
当a=
-1时,原式=3
=1
-1+13
.3 3