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