问题
解答题
先简化,再求值:(1+
|
答案
原式=(
+x2-1 x2-1
)÷[1 x2-1
-x(x+1) x+1
]×5x x+1 5
=
•x2 x2-1
•5x+1 x2
=5
,5 5 x-1
将x=
+1代入上式,得5
=5 5 x-1
=5.5 5 5
先简化,再求值:(1+
|
原式=(
+x2-1 x2-1
)÷[1 x2-1
-x(x+1) x+1
]×5x x+1 5
=
•x2 x2-1
•5x+1 x2
=5
,5 5 x-1
将x=
+1代入上式,得5
=5 5 x-1
=5.5 5 5