问题
解答题
已知a=
|
答案
∵a=
=2-1 2+ 3
,3
=2+1 a
,3
∴
>a,即1 a
-a>0,1 a
则
+1 a
=
+a2-21 a2
+|1 a
-a|=1 a
+1 a
-a=1 a
-a=4+22 a
-2+3
=2+33
.3
已知a=
|
∵a=
=2-1 2+ 3
,3
=2+1 a
,3
∴
>a,即1 a
-a>0,1 a
则
+1 a
=
+a2-21 a2
+|1 a
-a|=1 a
+1 a
-a=1 a
-a=4+22 a
-2+3
=2+33
.3