问题
解答题
先化简后求值:(1+
|
答案
原式=
÷a-1+1 a-1
=a-a(a-1) (a+1)(a-1)
•a a-1
=(a+1)(a-1) -a(a-2)
,a+1 2-a
当a=
时,原式=1 4
=
+11 4 2- 1 4
.5 7
先化简后求值:(1+
|
原式=
÷a-1+1 a-1
=a-a(a-1) (a+1)(a-1)
•a a-1
=(a+1)(a-1) -a(a-2)
,a+1 2-a
当a=
时,原式=1 4
=
+11 4 2- 1 4
.5 7