问题
解答题
计算:
|
答案
+2 a2-1
,1 a+1
=
+2 (a+1)(a-1)
,1 a+1
=
+2 (a+1)(a-1)
,a-1 (a+1)(a-1)
=
,2+a-1 (a+1)(a-1)
=
,a+1 (a+1)(a-1)
=
.1 a-1
计算:
|
+2 a2-1
,1 a+1
=
+2 (a+1)(a-1)
,1 a+1
=
+2 (a+1)(a-1)
,a-1 (a+1)(a-1)
=
,2+a-1 (a+1)(a-1)
=
,a+1 (a+1)(a-1)
=
.1 a-1