问题
填空题
当x=
|
答案
当x=
时,2
+x+1 x-1
-x+1 x-1
=(
+x+1
)2x-1 ((
-x+1
)(x-1
+x+1
)x-1
=2x+2 x2-1 2
=x+x2-1
=
+2 2-1
=1+
,2
故答案为:1+
.2
当x=
|
当x=
时,2
+x+1 x-1
-x+1 x-1
=(
+x+1
)2x-1 ((
-x+1
)(x-1
+x+1
)x-1
=2x+2 x2-1 2
=x+x2-1
=
+2 2-1
=1+
,2
故答案为:1+
.2