问题
解答题
先化简后求值:(
|
答案
(
+1 x-1
)÷1 x+1
=(x x2-1
+1 x-1
)×1 x+1
=(x+1)(x-1) x
,2 x
把x=4代入原式得:
原式=
=2 4
.1 2
先化简后求值:(
|
(
+1 x-1
)÷1 x+1
=(x x2-1
+1 x-1
)×1 x+1
=(x+1)(x-1) x
,2 x
把x=4代入原式得:
原式=
=2 4
.1 2